A high-pressure roller mill screening pre-slurrying system and its control method

Abstract

This invention discloses a high-pressure roller mill screening pre-slurrying system and control method, relating to the field of mineral processing roller mill slurrying technology; it includes a high-pressure roller mill, pre-slurrying equipment, a wet screening machine, and a ball mill pump tank; the pre-slurrying equipment includes a feed box with a feed inlet and flushing water pipe at the top, and a feed chamber and triangular ribs inside; a slurrying tank with opposing water pipes on both sides at an opposing angle of 120°±5°; multiple sets of slurrying sub-water pipes at one end of the slurrying tank; a water supply controller including a main slurrying water pipe, with a PID variable frequency booster pump, an electromagnetic flow meter, and a pressure sensor installed on both the main slurrying water pipe and the opposing water pipe; and an integrated control system including a PLC control box, which links and regulates the roller pressure of the high-pressure roller mill to 100-110 bar and the slurrying water flow rate to 10-30 m³ / h. 3 The system employs a constant water pressure of 0.3-0.6 MPa and a wet screening machine amplitude of 3-8 mm to address the technical problem of insufficient feed uniformity in existing wet roller mill screening systems.

Description

Technical Field

[0001] This invention relates to the field of mineral processing roller mill pulping technology, specifically to a high-pressure roller mill screening pre-pulping system and control method. Background Technology

[0002] High-pressure roller mill is a new type of high-efficiency mineral processing equipment developed using the principle of lamination crushing. It makes full use of the working mechanism of lamination crushing and the crushing method is quasi-static pressure crushing. Its energy utilization rate is very high. The high-pressure roller system of Dongbo mineral processing plant is designed to process: roller mill output with a proportion of less than 3mm > 55%, and screened finished product > 500t / h. The process adopts a closed-loop process of high-pressure roller mill - wet inspection screening.

[0003] Wet screening leads to excessive moisture in the feed material to the high-pressure roller mill. After lamination, the material forms a cake-like shape. When it re-enters the screening process, the material has poor flowability, uneven distribution, and accumulates after screening. This affects the service life of the screen plate and prevents the material from being dispersed. Qualified products fail to pass through the screen, resulting in excessive sand content, accounting for more than 50% and low efficiency.

[0004] The wet screening machine currently used at Dongbo Mineral Processing Plant is a segmented water spray system. While ensuring wet screening, it fails to stably regulate the concentration in the pump pool, thus hindering the improvement of the high-pressure roller mill's grinding efficiency. Existing patent CN216573541U outlines an optimized high-pressure roller wet screening system, but it does not address the issue of feed uniformity. Therefore, we provide a tower mill fine-selection system and control method to solve these problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a tower mill screening system and control method to solve the technical problem of lacking a good solution for feed uniformity in existing wet roller mill screening systems.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A high-pressure roller mill screening pre-slurry system includes a high-pressure roller mill, a wet screening machine, and a ball mill pump tank;

[0008] A pre-slurry preparation device is also installed between the high-pressure roller mill and the wet screening machine;

[0009] Pre-slurry equipment includes:

[0010] The feeding box has a feeding port at the top and a feeding chamber inside; a triangular rib plate is installed in the feeding chamber, and a rinsing water pipe is installed on the feeding box.

[0011] The pulping tank has a 45° inclined step at the bottom and is covered with a ceramic wear-resistant plate; it also has flushing water pipes on both sides with a flushing angle of 120°±5°; and multiple sets of pulping sub-water pipes are provided at one end of the pulping tank.

[0012] The water supply controller includes the main pulping water pipe, and a PID variable frequency booster pump, an electromagnetic flow meter and a pressure sensor are installed on both the main pulping water pipe and the flushing water pipe.

[0013] The integrated control system, including a PLC control box, coordinates and regulates the high-pressure roller mill pressure at 100-110 bar and the pulping water flow rate at 10-30 m³ / h. 3 / h, flushing water pressure 0.3-0.6MPa, and wet screening machine amplitude between 3-8mm.

[0014] In a further technical solution, the feed box has a rectangular box structure with dimensions of 1500mm (length) × 600mm (width) × 1300mm (height), and the side walls are lined with 30mm thick ceramic wear-resistant plates. The interior features a 60° sloped funnel-shaped flow guide plate, with a triangular rib welded in the middle to form a diversion chamber. The flushing water pipe is a DN25 pipe, and the flushing water flow rate ranges from 0.5 to 1.2m / s. 3 / h.

[0015] In a further technical solution, the dimensions of the pulping tank are 3000mm long × 1500mm wide × 650mm high, with a 45° inclined step and a 30mm thick ceramic wear-resistant plate at the bottom; and 8 sets of DN100 pulping sub-pipes are installed at the back.

[0016] In a further technical solution, the height of the triangular rib plate is 2 / 3 of the height of the box, the top has a 30° pointed angle structure, the cross-section of the diversion cavity is trapezoidal, and the ratio of the long side to the short side is 1.5:1.

[0017] In a further technical solution, the integrated control system includes:

[0018] The concentration feedback module adjusts the frequency of the PID variable frequency booster pump in real time via an online concentration meter installed at the outlet of the pulping tank.

[0019] The particle size compensation module dynamically adjusts the roller gap of the high-pressure roller mill based on the laser particle size analyzer data from the discharge port of the wet screening machine.

[0020] In a further technical solution, an agitator is also installed inside the pulping tank. The agitator is equipped with stirring blades. There are multiple sets of agitator, and the ends of all agitator extend outside the pulping tank and are equipped with transmission gears.

[0021] A crushing plate is also installed on the stirring rod;

[0022] A position plate is installed outside the pulping tank, and a drive motor is installed on the position plate. A main position gear is installed at the output end of the drive motor.

[0023] The master gear and the transmission gear are arranged in parallel and are equipped with a pressing component, which is suitable for synchronous transmission of the master gear and the transmission gear.

[0024] In a further technical solution, the pressing component includes a lower toothed plate and an upper pressing plate. The lower toothed plate is installed at the bottom of the upper pressing plate, and the bottom of the lower toothed plate has a toothed shape. The lower toothed plate meshes with the main gear and the transmission gear.

[0025] Lead screws are installed on both sides of the upper pressing plate, and positioning nuts are installed above and below the lead screws of the upper pressing plate; a guide groove is opened on the side of the upper pressing plate facing the lower toothed plate; a protrusion is installed on the top of the lower toothed plate, and the protrusion is restricted to sliding within the guide groove.

[0026] In a further technical solution, the crushing plate includes a fixing part, and the fixing part is fixedly connected to the inner wall of the pulping tank; a transition groove is provided on the crushing plate, a striking plate is provided in the transition groove, a branch plate is installed outside the transition groove, and a return spring is installed between the striking plate and the branch plate, one end of the return spring is fixedly connected to the striking plate, and the other end is fixedly connected to the branch plate.

[0027] The height of the stirring blade at its highest position is higher than the bottom height of the striking plate, and the stirring blade moves in contact with the striking plate when rotating.

[0028] A method for controlling pre-slurry preparation in high-pressure roller mill screening includes the following steps:

[0029] S1. The high-pressure roller mill output is conveyed to the feed box via belt, enters through the feed inlet, and is flushed with water through the flushing water pipe at a flow rate of Q1 = 0.8 ± 0.2 m³ / h. 3 / h;

[0030] The disc-shaped material is initially broken up by cutting with triangular ribs;

[0031] S2. The flushing water in the pulping tank is controlled at pressure P1 = 0.45 ± 0.05 MPa, and the pulping water pressure is P2 = 0.25 ± 0.03 MPa. The flushing water and the pulping water form a swirling flow field, and the pulp concentration is controlled at 55-65%.

[0032] When the slurry enters the slurry tank, the equipment is turned on simultaneously, causing the output of the drive motor to drive the main gear to rotate. The main gear drives the lower toothed plate to move and drives the transmission gear to rotate, which in turn drives the stirring rod to rotate. The stirring blades on the stirring rod rotate and move to abut against the striking plate. The striking plate moves to strike the slurry, thereby further dispersing the material. Finally, the stirring blades achieve full dispersion.

[0033] S3. The material oversize from the wet screening machine is returned to the high-pressure roller mill, and the material undersize enters the pump tank after passing online inspection.

[0034] S4. When the amount of back sand detected is >40%, automatically increase the counter-flushing water pressure ΔP = +0.1MPa and reduce the roller gap of the high-pressure roller mill by 0.2-0.5mm.

[0035] Compared with existing technologies, it has the following advantages:

[0036] This invention simultaneously addresses the issues of improved stability of the slurry entering the screening process through a pre-slurry system, and enhanced feed uniformity that extends the service life of the screen plates and screening machine. The pre-slurry system pre-mixes the slurry to increase the proportion of qualified products entering the pump tank. Furthermore, the pre-slurry system effectively disperses cake-like materials in advance, improving screening efficiency and ensuring a stable output of qualified products. This reduces the amount of sand backflow in the high-pressure roller mill, thereby increasing the mill's grinding efficiency.

[0037] This invention uses an upper pressing plate pressed onto a lower toothed plate, connected by T-shaped guide grooves and protrusions to achieve longitudinal positioning of the lower toothed plate, while the guide groove screw does not restrict the lateral movement of the lower toothed plate. A coupling is installed on a positioning plate to support the stirring shaft extending outside the pulping tank. A transmission gear is installed at the end; the main gear rotates with the drive motor, meshing with the transmission gear to achieve rotation of the stirring shaft. The stirring blades periodically strike the bottom of the striking plate, achieving the rotation effect of the striking plate and dispersing and mixing the material. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the high-pressure roller mill screening pre-slurry system of the present invention;

[0039] Figure 2 This is a front view schematic diagram of the installation of the pre-slurry preparation equipment of the present invention;

[0040] Figure 3 This is a schematic diagram of the pre-slurry preparation equipment of the present invention;

[0041] Figure 4 This is a schematic diagram of the interior of the feed box of the present invention;

[0042] Figure 5 This is a schematic diagram of the structure of the pulping tank of the present invention;

[0043] Figure 6 This is a cross-sectional view of the pulping tank in this invention. Figure 1 ;

[0044] Figure 7 This is a cross-sectional view of the pulping tank in this invention. Figure 2 ;

[0045] Figure 8 for Figure 7 Enlarged structural diagram at point A;

[0046] Figure 9 This is a top view of the material crushing plate of the present invention;

[0047] Figure 10 A schematic diagram of the back of the pulping box body of the present invention. Figure 1 ;

[0048] Figure 11 A schematic diagram of the back of the pulping box of the present invention. Figure 2 (Remove the drive motor);

[0049] Figure 12 This is a side view of the upper pressing plate, lower toothed plate, and position plate of the present invention.

[0050] In the picture:

[0051] 1. High-pressure roller mill; 2. Wet screening machine; 3. Ball mill pump tank;

[0052] 4. Pre-slurry preparation equipment;

[0053] 5. Feed box body; 51. Feed inlet; 52. Flushing water pipe; 53. Trumpet-shaped flow guide plate; 54. Triangular rib plate;

[0054] 6. Pulping tank; 61. Counter-flush water pipe; 62. Pulping sub-water pipe; 63. Inclined steps;

[0055] 64. Agitator rod; 65. Transmission gear; 66. Crushing plate; 67. Positioning plate; 68. Drive motor; 69. Main gear; 610. Lower toothed plate; 611. Upper pressing plate; 612. Lead screw; 613. Guide groove;

[0056] 661. Fixing part; 662. Transition groove; 663. Striking plate; 664. Branch plate; 665. Return spring;

[0057] 7. PLC control box; 71. Concentration feedback module; 72. Particle size compensation module;

[0058] 8. Main pulping water pipe; 9. PID variable frequency booster pump; 10. Electromagnetic flow meter; 11. Pressure sensor; Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0060] Example 1

[0061] Please see Figure 1-6 This invention provides a technical solution: a high-pressure roller mill screening pre-slurry system, comprising a high-pressure roller mill 1, a wet screening machine 2, and a ball mill pump pool 3; a pre-slurry equipment 4 is also installed between the high-pressure roller mill 1 and the wet screening machine 2; the pre-slurry equipment performs secondary rinsing and dispersing on the cake-shaped material after wet grinding by the high-pressure roller mill, preparing it for entry into the wet screening machine.

[0062] The pre-slurry preparation equipment 4 includes: a feed tank 5, a slurry preparation tank 6, a water supply controller, and an integrated control system;

[0063] The top of the feeding box 5 is provided with a feeding port 51, and the feeding box 5 is provided with a feeding chamber; a triangular rib plate is installed in the feeding chamber, which is used to impact and disperse part of the material; a flushing water pipe 52 is provided on the feeding box 5.

[0064] The pulping tank 6 has a 45° inclined step 63 at the bottom and is covered with a ceramic wear-resistant plate; and flushing water pipes 61 are provided on both sides, with a flushing angle of 120°±5°, which refers to the included angle between the two flushing water pipes; and multiple sets of pulping sub-water pipes 62 are provided at one end of the pulping tank 6.

[0065] The water supply controller includes a main pulping water pipe 8, and a PID variable frequency booster pump 9, an electromagnetic flow meter 10, and a pressure sensor 11 are installed on both the main pulping water pipe 8 and the flushing water pipe 61; Figure 2 As shown, the PID variable frequency booster pump 9, electromagnetic flow meter 10, and pressure sensor 11 located on the flushing water pipe and the pulping main water pipe are drawn.

[0066] The integrated control system includes a PLC control box 7, which coordinates and regulates the pressure of the high-pressure roller mill 1 at 100-110 bar and the pulping water flow rate at 10-30 m³ / h. 3 / h, flushing water pressure 0.3-0.6MPa, and wet screening machine amplitude between 3-8mm.

[0067] The feed box 5 has a rectangular box structure with dimensions of 1500mm (length) × 600mm (width) × 1300mm (height). The side walls are lined with 30mm thick ceramic wear-resistant plates. The interior features a 60° flared flow guide plate 53, with a triangular rib plate 54 welded in the middle to form a diversion chamber. The flushing water pipe 52 is a DN25 pipe, with a flushing water flow rate ranging from 0.5 to 1.2m / s. 3 / h.

[0068] The dimensions of the pulping tank 6 are 3000mm long × 1500mm wide × 650mm high. The bottom is equipped with a 45° inclined step 63 and a 30mm thick ceramic wear-resistant plate; the back is equipped with 8 sets of DN100 pulping sub-pipes 62.

[0069] The top of the triangular rib plate 54 has a 30° pointed angle structure, and the cross-section of the diversion cavity is trapezoidal with a ratio of 1.5:1 between the long side and the short side.

[0070] The integrated control system includes: a concentration feedback module 71, which adjusts the frequency of the PID variable frequency booster pump 9 in real time through an online concentration meter installed at the outlet of the pulping tank 6;

[0071] The particle size compensation module 72 dynamically adjusts the roller gap of the high-pressure roller mill 1 based on the laser particle size analyzer data from the discharge port of the wet screening machine 2. The online concentration meter and laser particle size analyzer are not shown in the attached diagram; alternative products can be used for testing in actual use. This module collects and feeds back the data, and processes the data and controls the corresponding equipment in real time via a PLC control box.

[0072] Process:

[0073] 1. The material discharged from the crushing system is conveyed to the high-pressure roller mill via a belt conveyor, where it is crushed by the roller surface to produce roller mill material.

[0074] 2. The roller mill material enters the pre-slurry system, where it is mixed with flushing water and slurry water to form a slurry that enters the screening machine.

[0075] 3. The slurry enters the screening process, coarse particles are returned to the high-pressure roller mill, and qualified products enter the pump tank.

[0076] 4. The system dynamically adjusts various parameters based on online detection data to ensure that product concentration and particle size meet the standards.

[0077] Table 1. Key Equipment Parameters

[0078]

[0079] Table 2. Comparison of Usage

[0080]

[0081]

[0082] Table 1 shows the adapted equipment parameters, specifically the processing parameters of the high-pressure roller mill and the wet screening machine. The corresponding data are input into their respective controllers. Table 2 shows the comparison data between the pre-slurry system and the standalone wet screening process, demonstrating that the pre-slurry equipment has a good improvement effect on the entire pre-slurry system.

[0083] This invention has the following advantages:

[0084] ① Integrated design: Integrating high-pressure roller mill with pre-slurrying process reduces equipment investment and energy consumption.

[0085] ② Integrated control mechanism: By coordinating the control of multiple parameters such as ore, roller gap, water volume, and belt conveyor speed, the problem of fluctuation in slurry concentration and particle size in wet screening is solved, thereby improving screening and roller mill efficiency.

[0086] ③ Environmental optimization: The use of wet screening and pulping systems reduces dust generated by roller mills and belt conveyors.

[0087] This invention simultaneously addresses the issues of improved stability of the slurry entering the screening process through a pre-slurry system, and enhanced feed uniformity that extends the service life of the screen plates and screening machine. The pre-slurry system pre-mixes the slurry to increase the proportion of qualified products entering the pump tank. Furthermore, the pre-slurry system effectively disperses cake-like materials in advance, improving screening efficiency and ensuring a stable output of qualified products. This reduces the amount of sand backflow in the high-pressure roller mill, thereby increasing the mill's grinding efficiency.

[0088] This invention can reduce the energy consumption of high-pressure roller mills by 10%; improve the stability of pump pool concentration (fluctuation range <10%); increase the slurry particle size qualification rate to over 75%; and is applicable to various scenarios such as high-hardness ore and tailings reprocessing, with strong scalability.

[0089] Example 2

[0090] like Figure 7-12 As shown, another embodiment of the present invention is provided. Based on embodiment 1, in order to achieve secondary crushing of cake-shaped materials in the pulping tank, an agitator 64 is also installed in the pulping tank 6. The agitator 64 is provided with stirring blades. Multiple sets of agitator 64 are provided, and the ends of all agitator 64 extend to the outside of the pulping tank 6 and are equipped with transmission gears 65. A crushing plate 66 is also installed on the agitator 64.

[0091] A position plate 67 is installed outside the pulping tank 6, and a drive motor 68 is installed on the position plate 67. A main gear 69 is installed at the output end of the drive motor 68. The main gear 69 and the transmission gear 65 are arranged in parallel and are fitted with a pressing component. The pressing component is suitable for synchronously driving the main gear 69 and the transmission gear 65.

[0092] like Figure 10-12 As shown, the pressing component includes a lower toothed plate 610 and an upper pressing plate 611. The lower toothed plate 610 is installed at the bottom of the upper pressing plate 611. The bottom of the lower toothed plate 610 has a toothed shape. The lower toothed plate 610 meshes with the main gear 69 and the transmission gear 65.

[0093] Lead screws 612 are respectively installed on both sides of the upper pressing plate 611, and positioning nuts are installed above and below the lead screws 612 of the upper pressing plate 611; a guide groove 613 is formed on the side of the upper pressing plate 611 facing the lower toothed plate 610; a protrusion is installed on the top of the lower toothed plate 610, and the protrusion is restricted to sliding within the guide groove 613. This invention achieves the following by pressing the upper pressing plate onto the lower toothed plate and connecting them through the T-shaped guide groove and protrusion: the lower toothed plate... Figure 10 The longitudinal limit is in the middle, while the guide groove screw does not restrict the lateral movement of the lower toothed plate; the stirring shaft extends to the outside of the pulping box and a coupling is installed on the position plate for support effect; a transmission gear is installed at the end, and the main position gear is driven by the rotation of the drive motor to achieve rotation, and meshes with the transmission gear to achieve the rotation of the stirring shaft.

[0094] like Figure 9 As shown, the crushing plate 66 includes a fixing part 661, which is fixedly connected to the inner wall of the pulping tank 6. A transition groove 662 is provided on the crushing plate 66, and a striking plate 663 is provided inside the transition groove 662. A branch plate 664 is installed outside the transition groove 662. A return spring 665 is installed between the striking plate 663 and the branch plate 664. One end of the return spring 665 is fixedly connected to the striking plate 663, and the other end is fixedly connected to the branch plate 664. The height of the stirring blade at its highest position is higher than the bottom height of the striking plate 663, and the stirring blade moves and abuts against the striking plate 663 during rotation. The stirring blade periodically strikes the bottom of the striking plate, achieving the rotation effect of the striking plate and the effect of dispersing and mixing the material.

[0095] A method for controlling pre-slurry preparation in high-pressure roller mill screening includes the following steps:

[0096] S1. The high-pressure roller mill output is conveyed by belt to the feed box 5, enters through the feed inlet 51, and is flushed with water through the flushing water pipe 52 at a flow rate of Q1 = 0.8 ± 0.2 m³ / s. 3 / h;

[0097] The disc-shaped material is initially broken up by cutting with triangular rib plate 54;

[0098] S2. The flushing water inside the pulping tank 6 is controlled with pressure P1 = 0.45 ± 0.05 MPa and pulping water pressure P2 = 0.25 ± 0.03 MPa. The flushing water and pulping water form a swirling field, and the pulp concentration is controlled at 55-65%.

[0099] When the pulping water enters the pulping tank 6, the equipment is turned on simultaneously, causing the output end of the drive motor 68 to drive the main gear 69 to rotate. The main gear 69 drives the lower toothed plate 610 to move and drives the transmission gear 65 to rotate, which in turn drives the stirring rod 64 to rotate. The stirring blades on the stirring rod 64 rotate and move to abut against the striking plate 663. The striking plate 663 moves to strike the pulp water, thereby further dispersing the material. Finally, the material is fully dispersed through the flushing water at the bottom and the stirring blades.

[0100] S3. The material oversize from wet screening machine 2 is returned to high-pressure roller mill 1, and the material undersize enters the pump pool after passing online detection.

[0101] S4. When the amount of back sand detected is >40%, automatically increase the counter-flushing water pressure ΔP = +0.1MPa and reduce the gap of the first roller of the high-pressure roller mill by 0.2-0.5mm.

[0102] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0103] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-pressure roller mill screening pre-slurry system, comprising a high-pressure roller mill (1), a wet screening machine (2), and a ball mill pump pool (3); Its features are, A pre-slurry preparation device (4) is also installed between the high-pressure roller mill (1) and the wet screening machine (2); Pre-slurry equipment (4) includes: The feeding box (5) has a feeding port (51) at the top and a feeding chamber inside; a triangular rib plate (54) is installed in the feeding chamber and a flushing water pipe (52) is installed on the feeding box (5). The pulping tank (6) has a 45° inclined step (63) at the bottom and is covered with a ceramic wear-resistant plate; and has flushing water pipes (61) on both sides with a flushing angle of 120°±5°; and has multiple sets of pulping sub-water pipes (62) at one end of the pulping tank (6). A stirring rod (64) is also installed inside the pulping tank (6). The stirring rod (64) is equipped with stirring blades. There are multiple sets of stirring rods (64), and the ends of all of them extend to the outside of the pulping tank (6) and are equipped with transmission gears (65). A crushing plate (66) is also installed on the stirring rod (64); A position plate (67) is installed outside the pulping tank (6), and a drive motor (68) is installed on the position plate (67). A main gear (69) is installed at the output end of the drive motor (68). The main gear (69) and the transmission gear (65) are arranged in parallel and are fitted with a pressing member, which is suitable for synchronous transmission of the main gear (69) and the transmission gear (65). The crushing plate (66) includes a fixing part (661), and the fixing part (661) is fixedly connected to the inner wall of the pulping box (6); a transition groove (662) is provided on the crushing plate (66), a striking plate (663) is provided in the transition groove (662), a branch plate (664) is installed outside the transition groove (662), a return spring (665) is installed between the striking plate (663) and the branch plate (664), one end of the return spring (665) is fixedly connected to the striking plate (663), and the other end is fixedly connected to the branch plate (664); The height of the stirring blade at its highest position is higher than the bottom height of the striking plate (663), and the stirring blade moves and abuts against the striking plate (663) when rotating; The water supply controller includes a pulping main water pipe (8), and a PID variable frequency booster pump (9), an electromagnetic flow meter (10) and a pressure sensor (11) are installed on both the pulping main water pipe (8) and the flushing water pipe (61). The integrated control system includes a PLC control box (7), which links and controls the high-pressure roller mill (1) with roller pressure of 100-110 bar, pulping water flow rate of 110-300 m³ / h, counter-flushing water flow rate of 110-160 m³ / h, and wet screening machine (2) with amplitude between 3-8 mm.

2. The high-pressure roller mill screening pre-slurry system according to claim 1, characterized in that, The feed box (5) has a rectangular box structure with dimensions of 1500mm long × 600mm wide × 1300mm high. The side walls are covered with 30mm thick ceramic wear-resistant plates. The interior is equipped with a 60° slope flared flow guide plate (53), and a triangular rib plate (54) is welded in the middle to form a diversion cavity. The flushing water pipe (52) is a DN25 water pipe with a flushing water flow rate range of 0.5-1.2m³ / h.

3. The high-pressure roller mill screening pre-slurry system according to claim 1, characterized in that, The pulping tank (6) has dimensions of 3000mm in length, 1500mm in width, and 650mm in height. The bottom is provided with a 45° inclined step (63) and a 30mm thick ceramic wear-resistant plate. Eight sets of DN100 pulping sub-pipes (62) are provided on the back.

4. The high-pressure roller mill screening pre-slurry system according to claim 1, characterized in that, The top of the triangular rib plate (54) has a 30° pointed angle structure, and the cross-section of the diversion cavity is trapezoidal with a ratio of 1.5:1 between the long side and the short side.

5. The high-pressure roller mill screening pre-slurry system according to claim 1, characterized in that, The integrated control system includes: The concentration feedback module (71) detects the concentration by installing it at the outlet of the pulping tank (6) and adjusts the frequency of the PID variable frequency booster pump (9) in real time. The particle size compensation module (72) performs particle size detection based on the discharge port of the wet screening machine (2) and dynamically adjusts the roller gap of the high-pressure roller mill (1) based on the data.

6. The high-pressure roller mill screening pre-slurry system according to claim 5, characterized in that, The pressing component includes a lower toothed plate (610) and an upper pressing plate (611). The lower toothed plate (610) is installed at the bottom of the upper pressing plate (611). The bottom of the lower toothed plate (610) has a toothed shape. The lower toothed plate (610) meshes with the main gear (69) and the transmission gear (65). Lead screws (612) are installed on both sides of the upper pressing plate (611), and positioning nuts are installed above and below the lead screws (612) of the upper pressing plate (611); a guide groove (613) is provided on the side of the upper pressing plate (611) facing the lower toothed plate (610); a protrusion is installed on the top of the lower toothed plate (610), and the protrusion is restricted to sliding within the guide groove (613).

7. A method for controlling pre-slurry preparation in high-pressure roller mill screening, characterized in that, The high-pressure roller mill screening pre-slurry system according to claim 6 comprises: S1. The high-pressure roller mill output is conveyed to the feed box (5) by belt, enters through the feed inlet (51), and is flushed with water through the flushing water pipe (52) with a flow rate of Q1=0.8±0.2m³ / h; The disc-shaped material is initially dispersed by cutting with triangular ribs (54); S2. The flushing water inside the pulping tank (6) is controlled with pressure P1=0.45±0.05MPa and pulping water pressure P2=0.25±0.03MPa. The flushing water and pulping water form a swirling field, and the pulp concentration is controlled at 55-65%. The pulping water enters the pulping tank (6), and the equipment is turned on simultaneously, causing the output end of the drive motor (68) to drive the main gear (69) to rotate. The main gear (69) drives the lower toothed plate (610) to move and drives the transmission gear (65) to rotate, which in turn drives the stirring rod (64) to rotate. The stirring blades on the stirring rod (64) rotate and move to abut against the striking plate (663). The striking plate (663) moves to strike the slurry water, thereby further dispersing the material. Finally, the stirring blades achieve full dispersion. S3. The material on the screen of the wet screening machine (2) is returned to the high-pressure roller mill (1), and the material under the screen enters the pump pool after passing the online inspection. S4. When the amount of reverse sand is detected to be >40%, the counter-flushing water pressure ΔP = +0.1MPa is automatically increased and the high-pressure roller mill (1) roller gap is reduced to 0.2-0.5mm.

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