Energy-saving pressure screen

Abstract

The utility model relates to the field of pressurized screens, in particular to an energy-saving pressurized screen which comprises a pressurized screen body, a rotor assembly and a screen cylinder, the pressurized screen body is provided with a containing cavity, the lower end of the containing cavity is provided with a heavy slag separation cavity, the lower cavity wall of the heavy slag separation cavity is provided with a heavy slag outlet, the cavity wall of the heavy slag separation cavity is provided with a slurry inlet, and the screen cylinder is embedded in the containing cavity. The screen drum divides the containing cavity into a stirring cavity and an accepted pulp filtering cavity, the stirring cavity is located on the inner side of the screen drum and communicated with the heavy residue separating cavity, a light residue outlet is formed in the upper end of the pressure screen body and communicated with the stirring cavity, and a pulp outlet is formed in the cavity wall of the accepted pulp filtering cavity. The rotor blades are connected to the periphery of the rotating shaft, are spiral and are uniformly distributed around the axis of the rotating shaft in the circumferential direction. And the periphery of the rotating shaft is connected with the rotor wing blades, and the rotor wing blades are spiral, so that resistance borne by the rotor wing blades during rotation is reduced, energy consumption is reduced, the production cost is reduced, and the energy-saving efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of pressure screens, and in particular to an energy-saving pressure screen. Background Art

[0002] In the secondary fiber papermaking and pulping process using waste paper as raw material, coarse screening plays a crucial role and is of great significance. Waste paper contains numerous impurities such as stickies and sand. If these impurities are not removed, they not only affect the quality of the pulp and finished paper, but can also damage machinery and equipment, disrupting normal production. Currently, the main coarse screening module for waste paper pulp in China uses an upflow pressure screen.

[0003] The upflow pressure screen adopts the method of pulp entering the bottom of the machine screen, pulp discharging from the screening part, and tailings discharging from the top. After the pulp enters the machine screen, the heavy residue gathers to the bottom of the separation area under the action of gravity, rotates at the bottom and is collected in the heavy residue tank. However, in actual operation, the equipment does not completely separate the heavy residue, causing some heavy residue to enter the screening area, increasing the operating load of the equipment, increasing the energy consumption of the motor, and reducing the service life of the blades and screen plates. In addition, the screen drum and rotor in the existing equipment cannot solve the problems of pulp thickening and paper sheet delamination, thereby affecting the screening efficiency. Utility Model Content

[0004] In order to reduce energy consumption, lower production costs and improve energy-saving efficiency, the present application provides an energy-saving pressure screen.

[0005] The energy-saving pressure screen provided in this application adopts the following technical solutions:

[0006] An energy-saving pressure screen comprises a pressure screen body, a rotor assembly and a screen drum; the pressure screen body is provided with a accommodating chamber; a heavy slag separation chamber is provided at the lower end of the accommodating chamber; a heavy slag outlet is provided at the lower chamber wall of the heavy slag separation chamber; a slurry inlet is provided at the chamber wall of the heavy slag separation chamber; the screen drum is embedded in the accommodating chamber; the screen drum divides the accommodating chamber into a stirring chamber and a good slurry filtration chamber; the stirring chamber is located on the inner side of the screen drum and is connected with the heavy slag separation chamber; a light slag outlet is provided at the upper end of the pressure screen body; the light slag outlet is connected with the stirring chamber; a slurry outlet is provided at the chamber wall of the good slurry filtration chamber; the rotor assembly comprises a rotating shaft and rotor blades; the rotating shaft is rotatably embedded in the stirring chamber; the rotating axis of the rotating shaft is vertical; the rotor blades are connected to the outer periphery of the rotating shaft; the rotor blades are spiral-shaped; there are a number of rotor blades; and the rotor blades are evenly distributed circumferentially around the axis of the rotating shaft.

[0007] By adopting the above technical solution, rotor blades are connected to the outer periphery of the rotating shaft, and the spiral shape of the rotor blades helps to reduce the resistance encountered by the rotor blades during rotation, reduce energy consumption, reduce production costs, and improve energy-saving efficiency.

[0008] Preferably, the rotor assembly also includes a sleeve and an adjusting rod; the sleeve is coaxially connected to the outer periphery of the rotating shaft; one end of the adjusting rod is connected to the outer wall of the sleeve; the other end of the adjusting rod is connected to the side of the rotor blade close to the sleeve; there are several adjusting rods; and the several adjusting rods are spaced apart along the length direction of the rotor blade.

[0009] By adopting the above technical solution, the rotor blades are connected to the sleeve through the adjusting rod, which facilitates the replacement and maintenance of the rotor blades and increases the service life of the rotor assembly.

[0010] Preferably, the sleeve is provided with a plurality of pulping holes; the plurality of pulping holes are circumferentially spaced around the axis of the sleeve.

[0011] By adopting the above technical solution, the slurry holes realize the circulation of slurry on both sides of the sleeve, reducing the possibility of local slurry accumulation, so as to improve the screening efficiency of the equipment.

[0012] Preferably, the rotor assembly also includes a nut; the sleeve is provided with a mounting hole; the adjusting rod is slidably embedded in the mounting hole; the number of the adjusting rods is the same as the number of the mounting holes and corresponds one to one; one adjusting rod corresponds to two nuts; the nut is threadedly connected to the adjusting rod; the two nuts are respectively located on both sides of the sleeve; the two nuts are pressed against the inner and outer sides of the sleeve.

[0013] By adopting the above technical solution, the nut is threadedly connected to the adjusting rod, and the two nuts are respectively pressed against the inner and outer sides of the sleeve to achieve relative fixation of the adjusting rod and the sleeve, and then achieve relative fixation of the rotor blades and the sleeve, thereby facilitating the adjustment of the distance between the rotor blades and the sleeve.

[0014] Preferably, the inner wall and / or outer wall of the sleeve are coaxially connected with a plurality of convex rings; the plurality of convex rings are distributed at intervals along the axial direction of the sleeve.

[0015] By adopting the above technical solution, the sleeve is coaxially connected with the convex ring, which improves the structural strength of the sleeve and increases the service life of the sleeve.

[0016] Preferably, the rotor blade includes a front arc section, a rear arc section and a connecting section; the front arc section is in the shape of a large arc; the front arc section is the pulp-facing side; the side of the front arc section away from the sleeve abuts against the inner wall of the screen drum; the rear arc section is in the shape of a small arc.

[0017] By adopting the above technical solution, the front arc section is the slurry-facing section, and the front arc section is in the shape of a large arc to improve the stirring effect of the rotor assembly. The rear arc section is in the shape of a small arc, and the front arc sections cooperate to ensure a smooth transition of the slurry between the rotor blades, reduce eddy currents and resistance, and improve the energy-saving efficiency of the equipment; the front arc section is used to abut the inner wall of the screen drum to achieve cleaning of the inside of the screen drum, reducing the possibility of impurities in the slurry clogging the filter holes of the screen drum.

[0018] Preferably, the periphery of the screen drum is connected with several flow-disturbing strips; several of the flow-disturbing strips are distributed at intervals along the axis direction of the sleeve.

[0019] By adopting the above technical solution, spoiler strips are set to improve the structural strength of the sleeve and increase the service life of the sleeve; the interval distribution of the spoiler strips helps to reduce the possibility of material clogging and agglomeration on the screen drum surface, thereby improving the working efficiency of the equipment.

[0020] Preferably, it also includes an anti-clogging component; the anti-clogging component includes a first pressure sensor, a second pressure sensor and an electromagnetic three-way valve; the first pressure sensor is embedded in the good pulp filtration chamber and detects the pressure in the good pulp filtration chamber; the second pressure sensor is embedded in the stirring chamber and detects the pressure in the stirring chamber; the outlet of the electromagnetic three-way valve is connected to the pulp inlet; the inlet of the electromagnetic three-way valve is respectively connected to the coarse pulp pipeline and the good pulp pipeline; the first pressure sensor, the second pressure sensor and the electromagnetic three-way valve are all electrically connected to the controller.

[0021] By adopting the above technical solution, the pressure in the good pulp filtration chamber is detected by the first pressure sensor, and the pressure in the stirring chamber is detected by the second pressure sensor. When the difference between the pressure in the good pulp filtration chamber and the pressure in the stirring chamber is greater than a certain range, the electromagnetic three-way valve is controlled by the controller to be on and off, so as to realize the introduction of good pulp into the stirring chamber, realize the cleaning of the equipment without stopping the machine, and improve work efficiency.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The outer periphery of the rotating shaft is connected to the rotor blades, and the spiral shape of the rotor blades helps to reduce the resistance encountered by the rotor blades during rotation, reduce energy consumption, reduce production costs, and improve energy efficiency;

[0024] 2. The front arc section is the slurry-facing section. The front arc section is in a large arc shape to improve the stirring effect of the rotor assembly, while the rear arc section is in a small arc shape. The front arc section cooperates with each other to ensure a smooth transition of the slurry between the rotor blades, reduce eddy currents and resistance, and improve the energy efficiency of the equipment. The front arc section is used to abut the inner wall of the screen drum to clean the inside of the screen drum and reduce the possibility of impurities in the slurry clogging the filter holes of the screen drum.

[0025] 3. The first pressure sensor is used to detect the pressure in the good pulp filtration chamber, and the second pressure sensor is used to detect the pressure in the stirring chamber. When the difference between the pressure in the good pulp filtration chamber and the pressure in the stirring chamber is greater than a certain range, the controller is used to control the on and off of the electromagnetic three-way valve to allow good pulp to be introduced into the stirring chamber, so that the equipment can be cleaned without stopping the machine, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a cross-sectional view of the energy-saving pressure screen of Example 1.

[0027] Figure 2 Schematic diagram of the structure of the energy-saving pressure screen of Example 1.

[0028] Figure 3 Schematic diagram of the structure of the rotor assembly and screen drum of Example 2.

[0029] Figure 4 It is a schematic structural diagram of the rotor assembly of Example 1.

[0030] Figure 5 It is a schematic structural diagram of the rotor assembly of Example 2.

[0031] Figure 6 It is a schematic structural diagram of the rotor assembly of Example 3.

[0032] Description of reference numerals:

[0033] 1. Pressure screen body; 11. Housing; 111. Accommodating chamber; 112. Heavy slag separation chamber; 113. Heavy slag outlet; 114. Slurry inlet; 115. Stirring chamber; 116. Good slurry filter chamber; 117. Slurry outlet; 118. First limiting ring; 119. Second limiting ring; 12. Cover; 121. Light slag outlet; 13. Slag discharge pipe;

[0034] 2. Rotor assembly; 21. Rotating shaft; 22. Rotor blade; 221. Front arc segment; 222. Connecting segment; 223. Rear arc segment; 23. Sleeve; 231. Slurry hole; 232. Mounting hole; 233. Raised ring; 234. Abutment seat; 24. Adjusting rod; 25. Nut; 26. Connecting plate; 261. Connecting ring; 262. Connecting rod; 27. Pulley;

[0035] 3. Screen drum; 31. Turbine strip; 32. Filter hole;

[0036] 4. Anti-clogging component; 41. First pressure sensor; 42. Second pressure sensor; 43. Solenoid three-way valve;

[0037] 5. Base; 51. Mounting cavity. DETAILED DESCRIPTION

[0038] The present application is further described in detail below with reference to the accompanying drawings.

[0039] The embodiment of the present application discloses an energy-saving pressure screen.

[0040] Example 1

[0041] Reference Figure 1An energy-saving pressure screen includes a base 5 and a pressure screen body 1. The pressure screen body 1 includes a shell 11 and a cover 12. The lower end of the shell 11 is fixedly connected to the upper end of the base 5. The upper end of the shell 11 is provided with a receiving cavity 111. A first limiting ring 118 is fixedly connected to the cavity wall of the receiving cavity 111 away from the base 5. The cover 12 is fixedly connected to the upper end of the shell 11 and covers the cavity opening of the receiving cavity 111. The inner wall of the cover 12 is flush with the inner wall of the first limiting ring 118.

[0042] Reference Figure 1 and Figure 2 A heavy slag separation chamber 112 is provided at the bottom of the accommodating chamber 111. The heavy slag separation chamber 112 is connected to the accommodating chamber 111. A second limiting ring 119 is provided between the heavy slag separation chamber 112 and the accommodating chamber 111. The second limiting ring 119 is coaxially fixedly connected to the inner wall of the shell 11. A heavy slag outlet 113 is provided at the bottom of the heavy slag separation chamber 112. A slag discharge pipe 13 is fixedly connected to the lower end of the shell 11. The slag discharge pipe 13 is connected to the heavy slag outlet 113. The other end of the slag discharge pipe 13 passes through the base 5 and then extends out of the base 5. A slurry inlet 114 is provided on the wall of the heavy slag separation chamber 112. The axis of the slurry inlet 114 is horizontal.

[0043] Reference Figure 1 , an energy-saving pressure screen also includes a screen drum 3. The screen drum 3 is coaxially fixedly connected to the accommodating chamber 111, and the outer wall of the screen drum 3 close to the base 5 is in contact with the inner wall of the second limiting ring 119, and the outer wall of the screen drum 3 away from the base 5 is in contact with the inner wall of the first limiting ring 118. The screen drum 3 divides the accommodating chamber 111 into a stirring chamber 115 and a good pulp filtration chamber 116. The outer wall of the screen drum 3, the inner wall of the shell 11, the side surface of the first limiting ring 118 facing the base 5 and the side surface of the second limiting ring 119 away from the base 5 constitute the good pulp filtration chamber 116, and the inside of the screen drum 3 is the stirring chamber 115. The shell 11 is provided with a pulp outlet 117, which is connected to the good pulp filtration chamber 116, and the axis of the pulp outlet 117 is perpendicular to the axis of the pulp inlet 114. A light residue outlet 121 is provided at the end of the cover body 12 away from the base 5, and the light residue outlet 121 is connected to the stirring chamber 115.

[0044] Reference Figure 3 The sieve drum 3 has a plurality of evenly distributed filter holes 32. In this embodiment, the filter holes 32 are rectangular. A flow-interference strip 31 is coaxially fixedly connected to the outer wall of the sieve drum 3. The flow-interference strip 31 is annular and evenly distributed along the axis of the sleeve 23. In this embodiment, there are nine flow-interference strips 31.

[0045] Reference Figure 2, an energy-saving pressure screen also includes an anti-clogging component 4. The anti-clogging component 4 includes a first pressure sensor 41, a second pressure sensor 42 and an electromagnetic three-way valve 43. The first pressure sensor 41 is embedded in the stirring chamber 115, and the first pressure sensor 41 is used to detect the pressure in the stirring chamber 115. The second pressure sensor 42 is embedded in the stirring chamber 115, and the second pressure sensor 42 is used to detect the pressure in the stirring chamber 115. The outlet of the electromagnetic three-way valve 43 is connected to the pulp inlet 114 through a pipeline, and the inlet of the electromagnetic three-way valve 43 is respectively connected to the coarse pulp pipeline and the good pulp pipeline. The first pressure sensor 41, the second pressure sensor 42 and the electromagnetic three-way valve 43 are all electrically connected to the controller, and the controller controls the on and off of the electromagnetic three-way valve 43 according to the pressure difference measured by the first pressure sensor 41 and the second pressure sensor 42.

[0046] Reference Figure 1 and Figure 4 , an energy-saving pressure screen also includes a rotor assembly 2. The rotor assembly 2 includes a rotating shaft 21, a connecting plate 26 and a sleeve 23. The upper end of the rotating shaft 21 is rotatably embedded in the stirring chamber 115, and the rotation axis of the rotating shaft 21 coincides with the axis of the screen drum 3. An installation cavity 51 is provided at the lower end of the base 5. The lower end of the rotating shaft 21 passes through the shell 11 and extends into the installation cavity 51. The outer periphery of the lower end of the rotating shaft 21 is coaxially fixedly connected with a pulley 27, and the pulley 27 is used for connection to an external driving mechanism. There are a plurality of connecting plates 26, and the plurality of connecting plates 26 are evenly distributed along the axial direction of the rotating shaft 21. In this embodiment, there are two connecting plates 26. The connecting plate 26 includes a connecting ring portion 261 and a connecting rod portion 262. The connecting ring portion 261 is coaxially mounted on the outer circumference of the rotating shaft 21. One end of the connecting rod portion 262 is fixedly connected to the outer circumference of the connecting ring portion 261, and the other end of the connecting rod portion 262 is fixedly connected to the inner wall of the sleeve 23. The axis of the sleeve 23 coincides with the axis of the rotating shaft 21. There are multiple connecting rod portions 262, and these multiple connecting rod portions 262 are evenly distributed circumferentially around the axis of the connecting ring portion 261. In this embodiment, there are four connecting rod portions 262. Several raised rings 233 are fixedly connected to the outer circumference of the sleeve 23, and these raised rings 233 are evenly distributed along the axis of the sleeve 23. In this embodiment, there are three raised rings 233.

[0047] Reference Figure 4The rotor assembly 2 also includes an adjustment rod 24, a nut 25, and a rotor blade 22. The sleeve 23 has a mounting hole 232 with a horizontal axis. The adjustment rod 24 slides within the mounting hole 232, with the sliding direction of the adjustment rod 24 parallel to the axis of the mounting hole 232. The sleeve 23 is fixedly connected to an abutment seat 234. The axis of the abutment seat 234 coincides with the axis of the mounting hole 232, and the ends of the abutment seat 234 along the axis are located on the inner and outer sides of the sleeve 23. The nut 25 is threadedly connected to the outer circumference of the adjustment rod 24. Two nuts 25 are associated with each adjustment rod 24, and the two nuts 25 respectively abut against the ends of the abutment seat 2354 along the axis of the abutment seat 2354. The rotor blade 22 is fixedly connected to the end of the adjustment rod 24 away from the rotating shaft 21. The rotor blade 22 has a spiral shape. There are multiple rotor blades 22, and the rotor blades are evenly distributed circumferentially around the axis of the rotating shaft 21. In this embodiment, six rotor blades 22 are provided.

[0048] Reference Figure 3 and Figure 4 , one rotor blade 22 corresponds to a number of adjustment rods 24, and the number of adjustment rods 24 is evenly distributed along the length direction of the rotor blade 22. In this embodiment, three adjustment rods 24 are provided. The number of mounting holes 232 and abutment seats 234 is the same as the number of adjustment rods 24 and corresponds one to one. The rotor blade 22 includes a front arc section 221, a connecting section 222 and a rear arc section 223. The front arc section 221 is in the shape of a large arc, and the front arc section 221 is a slurry-facing section. The side of the front arc section 221 away from the sleeve 23 abuts against the inner wall of the screen drum 3, and the rear arc section 223 is in the shape of a small arc. The connecting section 222 is fixedly connected between the front arc section 221 and the rear arc section 223, and the side wall of the connecting section 222 is tangent to the outer periphery of the front arc section 221 and the rear arc section 223.

[0049] The implementation principle of Example 1 is as follows: the slurry enters the heavy slag separation chamber 112 from the slurry inlet 114, the rotating shaft 21 rotates, driving the connecting plate 26 to rotate, driving the sleeve 23 to rotate, and driving the rotor blade 22 to rotate through the adjusting rod 24 to achieve stirring of the slurry in the stirring chamber 115. At the same time, the rotor blade 22 abuts against the inner wall of the screen drum 3 to clean the inner wall of the screen drum 3. The slurry enters the stirring chamber 115 and is stirred by the rotor assembly 2. The good slurry enters the good slurry filtration chamber 116 through the filter hole 32 of the screen drum 3 and flows out through the slurry outlet 117. The heavy slag sinks and is discharged from the heavy slag outlet 113 and the slag discharge pipe 13. The light slag moves up and is discharged from the light slag outlet 121.

[0050] Example 2

[0051] Reference Figure 5This embodiment differs from Embodiment 1 in that a protruding ring 233 is provided on the inner wall of the sleeve 23 and is located between the two connecting plates 26. The mounting hole 232 is located on the side of the connecting plate 26 away from the other connecting plate 26. One rotor blade 22 corresponds to two adjustment rods 24.

[0052] Example 3

[0053] Reference Figure 6 This embodiment differs from Embodiment 2 in that the sleeve 23 is provided with a plurality of pulping holes 231, which are evenly distributed circumferentially around the axis of the rotating shaft 21. In this embodiment, there are four pulping holes 231. The pulping holes 231 communicate with the inside and outside of the sleeve 23 and are located between the two connecting plates 26.

[0054] There are four rotor blades 22 , and one rotor blade 22 corresponds to two adjustment rods 24 .

[0055] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An energy-saving pressure screen, characterized by: The invention comprises a pressure screen body (1), a rotor assembly (2) and a screen drum (3); the pressure screen body (1) is provided with a receiving chamber (111); a heavy slag separation chamber (112) is provided at the lower end of the receiving chamber (111); a heavy slag outlet (113) is provided at the lower chamber wall of the heavy slag separation chamber (112); a pulp inlet (114) is provided at the chamber wall of the heavy slag separation chamber (112); the screen drum (3) is embedded in the receiving chamber (111); the screen drum (3) divides the receiving chamber (111) into a stirring chamber (115) and a good pulp filtering chamber (116); the stirring chamber (115) is located inside the screen drum (3) and is connected to the heavy slag separation chamber (112); A light residue outlet (121) is provided at the upper end of the pressure screen body (1); the light residue outlet (121) is communicated with the stirring chamber (115); a pulp outlet (117) is provided at the wall of the good pulp filter chamber (116); the rotor assembly (2) comprises a rotating shaft (21) and rotor blades (22); the rotating shaft (21) is rotatably embedded in the stirring chamber (115); the rotating axis of the rotating shaft (21) is vertical; the rotor blades (22) are connected to the outer periphery of the rotating shaft (21); the rotor blades (22) are spiral-shaped; a plurality of rotor blades (22) are provided; and the plurality of rotor blades (22) are evenly distributed circumferentially around the axis of the rotating shaft (21).

2. The energy-saving pressure screen according to claim 1, characterized in that: The rotor assembly (2) further comprises a sleeve (23) and an adjusting rod (24); the sleeve (23) is coaxially connected to the outer periphery of the rotating shaft (21); one end of the adjusting rod (24) is connected to the outer wall of the sleeve (23); the other end of the adjusting rod (24) is connected to a side of the rotor blade (22) close to the sleeve (23); a plurality of the adjusting rods (24) are provided; and the plurality of the adjusting rods (24) are spaced apart along the length direction of the rotor blade (22).

3. The energy-saving pressure screen according to claim 2, characterized in that: The sleeve (23) is provided with a plurality of pulping holes (231); the plurality of pulping holes (231) are circumferentially spaced around the axis of the sleeve (23).

4. The energy-saving pressure screen according to claim 2, characterized in that: The rotor assembly (2) further includes a nut (25); the sleeve (23) is provided with a mounting hole (232); the adjusting rod (24) is slidably embedded in the mounting hole (232); the number of the adjusting rods (24) is the same as the number of the mounting holes (232) and corresponds one to one; one adjusting rod (24) corresponds to two nuts (25); the nut (25) is threadedly connected to the adjusting rod (24); the two nuts (25) are respectively located on both sides of the sleeve (23); and the two nuts (25) are pressed against the inner and outer sides of the sleeve (23).

5. The energy-saving pressure screen according to claim 2, characterized in that: The inner wall and / or outer wall of the sleeve (23) are coaxially connected with a plurality of convex rings (233); the plurality of convex rings (233) are distributed at intervals along the axial direction of the sleeve (23).

6. The energy-saving pressure screen according to claim 1, characterized in that: The rotor blade (22) comprises a front arc section (221), a rear arc section (223) and a connecting section (222); the front arc section (221) is in the shape of a large arc; the front arc section (221) is the pulp-facing side; the side of the front arc section (221) away from the sleeve (23) abuts against the inner wall of the screen drum (3); and the rear arc section (223) is in the shape of a small arc.

7. The energy-saving pressure screen according to claim 1, characterized in that: The outer periphery of the screen drum (3) is connected to several flow-interference strips (31); a plurality of the flow-interference strips (31) are distributed at intervals along the axial direction of the sleeve (23).

8. The energy-saving pressure screen according to claim 1, characterized in that: It also includes an anti-clogging component (4); the anti-clogging component (4) includes a first pressure sensor (41), a second pressure sensor (42) and an electromagnetic three-way valve (43); the first pressure sensor (41) is embedded in the good pulp filtration chamber (116) and detects the pressure in the good pulp filtration chamber (116); the second pressure sensor (42) is embedded in the stirring chamber (115) and detects the pressure in the stirring chamber (115); the outlet of the electromagnetic three-way valve (43) is connected to the pulp inlet (114); the inlet of the electromagnetic three-way valve (43) is respectively connected to the coarse pulp pipeline and the good pulp pipeline; the first pressure sensor (41), the second pressure sensor (42) and the electromagnetic three-way valve (43) are all electrically connected to the controller.

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