Cement raw material vertical roller mill

Abstract

This invention relates to the field of cement processing technology, and more particularly to a vertical roller mill for cement raw materials, comprising a shell, a feed pipe connected to one side of the upper part of the shell, a column fixedly installed on the bottom wall of the inner part of the shell, a grinding disc mounted on the outer side of the column via a bearing, the grinding disc being driven to rotate by a drive mechanism located below it, a material cylinder fixedly connected to the top surface of the grinding disc on the outer side of the top of the column, the end of the feed pipe being located above the material cylinder, and a crushing mechanism being provided between the column and the material cylinder. This application integrates crushing, homogenization, drying, and sorting functions, significantly improving production continuity and product consistency; its design, through limit control, stable feeding, and resource recycling, effectively prevents vibration, wear, and material waste, and the overall system operation has a high degree of automation.

Description

Technical Field

[0001] This invention relates to the field of cement processing technology, and in particular to a vertical roller mill for cement raw materials. Background Technology

[0002] Vertical roller mills are widely used, high-efficiency grinding equipment in the industrial field, mainly suitable for grinding and refining various non-metallic minerals, cement raw materials, coal powder, and other powdered materials. Its core advantage over traditional horizontal mills lies in its vertical layout design. From top to bottom, the equipment comprises the feed inlet, grinding roller and grinding disc system, grading device, and discharge outlet. During operation, the powdered materials enter the mill chamber through the top feed inlet and are repeatedly crushed by the squeezing and grinding action of the grinding rollers. Afterwards, they are screened by the built-in grading system. Finished particles that meet the particle size requirements are carried out and collected by airflow, while unqualified coarse particles are returned to the grinding disc for further grinding, thus achieving efficient and precise powder processing.

[0003] However, the existing cement raw material processing technology usually has the following drawbacks: the raw material is not conveyed evenly after crushing, and it is easy to accumulate at the filter screen, causing blockage. This results in intermittent material shortages or accumulations, causing direct contact between the grinding roller and the grinding disc, which leads to equipment vibration and abnormal wear. Furthermore, large particles are difficult to recover and re-grind in a timely manner, affecting the overall processing efficiency. At the same time, the hot air in the drying process is not fully utilized, the moisture evaporation efficiency is low, and it is difficult to effectively separate dry and wet particles, resulting in uneven product humidity. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art, and to propose a vertical roller mill for cement raw materials.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a vertical roller mill for cement raw materials, comprising a shell, a feed pipe connected to one side of the upper part of the shell, a column fixedly installed on the bottom wall of the inner part of the shell, a grinding disc installed on the outer side of the column via a bearing, the grinding disc being driven to rotate by a drive mechanism located below it, a material cylinder fixedly connected to the top surface of the grinding disc on the outer side of the top of the column, the end of the feed pipe being located above the material cylinder, and a crushing mechanism being provided between the column and the material cylinder;

[0006] A filter screen is detachably installed on the outer periphery of the top of the grinding disc for filtering the raw material after it has been crushed by the crushing mechanism. An air groove is provided on the outer side of the grinding disc. The air groove is connected to an air inlet installed on the side wall of the outer shell. The end of the air inlet away from the air groove is connected to an external hot air supply device.

[0007] The outer shell is provided with an upper shell, and the upper shell is provided with a drying and separation mechanism, which is used to return large raw material particles to the material cylinder, and at the same time transport the dried small material particles to the outside of the outer shell.

[0008] Preferably, the driving mechanism includes a cavity between the grinding disc and the inner bottom wall of the outer casing. The cavity is provided with a bevel gear structure. The bevel gear structure includes a driven gear fixedly installed on the bottom surface of the grinding disc and a driving gear meshing with the driven gear. The driving gear is driven by a motor located on the outer side of the outer casing. The output end of the motor is connected to the driving gear through a reducer.

[0009] Preferably, the crushing mechanism includes toothed plates on the top surface of the column and on the inner side wall of the cylinder. The top of the column is located above the grinding disc. The toothed plates on the column and the cylinder are staggered. Multiple discharge ports are opened at equal angles at the bottom of the side wall of the cylinder. A material cover is installed below the side wall of the cylinder through a bearing. The lower end of the material cover is fixedly connected to the top of the grinding disc. Multiple discharge ports are opened at equal angles at the bottom of the side wall of the material cover. A material trough is formed between the inside of the material cover, the cylinder, and the grinding disc.

[0010] Preferably, the top of the column is tapered, and the inner diameter of the material cylinder is larger at the top and smaller at the bottom.

[0011] Preferably, the drying and separation mechanism includes a return cylinder fixedly installed in the middle of the upper shell, a motor three fixedly installed in the middle of the top wall of the shell, a fan connected to the output end of the motor three via a connecting shaft, the fan located above the inside of the return cylinder, a plate one fixedly connected to the upper outer side of the return cylinder, the plate one being connected to a slight positive voltage, a first annular plate fixedly installed on the upper outer side of the plate one, a gap being provided between the top of the first annular plate and the top wall of the shell, a material dropping groove being provided between the first annular plate and the outer wall of the return cylinder, a scraping component being provided inside the material dropping groove, and a conveying component being connected to the lower end, a second annular plate fixedly installed on the inner top wall of the shell on the outer side of the first annular plate, a metal mesh being provided between the second annular plate and the plate one, the plate one and the metal mesh being connected via an insulator, the metal mesh being connected to a negative voltage, and multiple air guide plates fixedly installed between the second annular plate and the top of the upper shell, the air guide plates being designed with a certain angle of inclination.

[0012] Preferably, the inner wall of the return cylinder is equipped with cooling plates to condense the gas entering the return cylinder, so that the generated water droplets flow back into the cylinder.

[0013] Preferably, the scraping assembly includes multiple scrapers disposed inside the material discharge trough. The top ends of the multiple scrapers are fixedly connected to an internal gear ring. A bearing three is installed on the outer side of the internal gear ring, and multiple gear two are meshed on the inner side. A gear one is meshed between the multiple gear two. The gear one is fixedly connected to the output end of the motor three. The gear one, gear two and the internal gear ring form a planetary reducer structure, so that the internal gear ring drives the multiple scrapers to rotate synchronously while rotating.

[0014] Preferably, the conveying assembly includes a material pipe communicating with the inside of the chute, the end of the material pipe being connected to an auger conveyor located on the outside of the housing, and the end of the auger conveyor being connected to a discharge pipe.

[0015] Preferably, a bidirectional auger is rotatably installed between each of the discharge ports and the filter screen. The bidirectional auger conveys the material at its head and tail to the middle. The bidirectional auger is driven by a motor fixedly installed on the outer wall of the outer shell. A limiting plate is fixedly installed between the material cover and the filter screen on one side of the bidirectional auger. The distance from the bottom of the limiting plate to the top surface of the grinding disc is slightly greater than the height of the discharge port. A grinding roller is rotatably connected to the side of the limiting plate away from the bidirectional auger. The grinding roller is in rotatable contact with the top surface of the grinding disc.

[0016] Preferably, an iron removal device is provided between the bidirectional auger and the grinding roller. The iron removal device is driven by a servo motor fixedly installed on the side wall of the outer casing and is used to remove iron impurities from the raw material.

[0017] Compared with existing technologies, the advantages of this invention are:

[0018] 1. This application uses a motor to drive the grinding disc to rotate at a uniform speed, which, together with the conical surface of the column and the evenly distributed toothed plate, efficiently crushes the cement raw material into particles of uniform size, ensuring that the raw material meets the requirements after grinding; the limiting plate precisely controls the height of the raw material layer, preventing vibration caused by accumulation and protecting the grinding roller and grinding disc from sudden impacts, and extending the service life of key components; the bevel gear and bearing structure ensures stable operation, improves crushing uniformity, and optimizes product quality from the source.

[0019] 2. In this application, the bidirectional auger continuously feeds raw material, effectively scraping off large particles from the filter screen and recycling them for re-grinding, keeping the filter screen unobstructed and preventing blockage; its uniform conveying function ensures a stable flow of raw material through the limit plate, preventing sudden material shortages from causing direct contact between the grinding roller and the grinding disc, reducing the risk of vibration and wear; under the action of centrifugal force, the raw material moves outward in an orderly manner, realizing particle classification, with small particles passing smoothly through the filter screen and large particles being blocked, improving processing efficiency and grinding reliability.

[0020] 3. In this application, the hot air system rapidly evaporates the moisture in the raw material, the air guide plate causes the airflow to swirl and separate large particles, and the charged metal mesh adsorbs the dry small particles to achieve precise sorting; the condensation device recovers the moisture in the wet raw material to replenish the evaporation loss during the feeding process and promotes the recycling of water resources; the scraper and screw conveyor automatically collect and output the dry raw material, improve the level of automation, reduce material waste, and ensure uniform dryness of the final product. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the operation of a vertical roller mill for cement raw materials proposed in this invention.

[0022] Figure 2 This is a rear-view isometric view of a vertical roller mill for cement raw materials proposed in this invention.

[0023] Figure 3 This invention provides a semi-sectional axial view of a vertical roller mill for cement raw materials. Figure 1 ;

[0024] Figure 4 for Figure 3 A magnified view of a section at point X;

[0025] Figure 5 for Figure 3 A magnified view of a portion of point Y in the middle;

[0026] Figure 6 The present invention provides a half-section axial side of a vertical roller mill for cement raw materials. Figure 2 ;

[0027] Figure 7 This is a schematic diagram of an iron removal device and a bidirectional auger structure for a vertical roller mill for cement raw materials, as proposed in this invention.

[0028] In the diagram: 1 Outer shell, 2 Upper shell, 11 Motor 1, 12 Feed pipe, 13 Discharge pipe, 14 Screw conveyor, 15 Servo motor, 16 Motor 2, 17 Air inlet, 18 Grinding roller, 19 Grinding disc, 110 Material cover, 111 Column, 112 Bevel gear structure, 113 Air duct, 114 Filter screen, 115 Bidirectional screw conveyor, 116 Material cylinder, 117 Bearing 1, 118 Bearing 2, 119 Discharge port, 120 Material trough, 121 Discharge port, 122 Material pipe, 123 Iron removal device, 133 Limiting plate, 21 Motor 3, 22 Return cylinder, 23 Fan, 24 Air guide plate, 25 Metal mesh, 26 Plate 1, 27 Scraper, 28 Drop chute, 29 Gear 1, 210 Gear 2, 211 Internal gear ring, 212 Bearing 3. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Reference Figures 1 to 7A vertical roller mill for cement raw materials includes a shell 1, with a feed pipe 12 connected to one side of the upper part of the shell 1. A column 111 is fixedly installed on the bottom wall of the inner side of the shell 1. A grinding disc 19 is installed on the outer side of the column 111 via a bearing 117. There is a cavity between the grinding disc 19 and the bottom wall of the inner side of the shell 1. A bevel gear structure 112 is provided inside the cavity. The bevel gear structure 112 includes a driven gear fixedly installed on the bottom surface of the grinding disc 19 and a driving gear meshing with the driven gear. The driving gear is driven by a motor 11 located on the outer side of the shell 1. The output end of the motor 11 is connected to the driving gear through a reducer. The top of the column 111 is located above the grinding disc 19 and has a tapered design. A material cylinder 116 is fixedly connected to the top surface of the grinding disc 19 on the outer side of the top. The end of the feed pipe 12 is located above the material cylinder 116. The upper end of the material cylinder 116 has a larger opening and the lower end has a smaller opening. Toothed plates are distributed on the top surface of the column 111 and the inner side wall of the material cylinder 116, and the toothed plates are staggered between them. Multiple discharge ports 119 are opened at equal angles at the bottom of the side wall of the material cylinder 116. A material cover 110 is installed below the side wall of the material cylinder 116 through a bearing 118. The lower end of the material cover 110 is fixedly connected to the top of the grinding disc 19, and multiple discharge ports 121 are opened at equal angles at the bottom of the side wall of the material cover 110. A material groove 120 is formed between the inside of the material cover 110, the material cylinder 116, and the grinding disc 19.

[0031] A filter screen 114 is detachably installed on the outer periphery of the top of the grinding disc 19. A bidirectional auger 115 is rotatably installed between each discharge port 121 and the filter screen 114. The bidirectional auger 115 conveys the material at its head and tail to the middle. The bidirectional auger 115 is driven by a motor 16 fixedly installed on the outer wall of the outer shell 1. A limiting plate 133 is fixedly installed between the material cover 110 and the filter screen 114 on one side of the bidirectional auger 115. The distance from the bottom of the limiting plate 133 to the top surface of the grinding disc 19 is slightly greater than the height of the discharge port 119. A grinding roller 18 is rotatably connected to the side of the limiting plate 133 away from the bidirectional auger 115. The grinding roller 18 is in rotatable contact with the top surface of the grinding disc 19.

[0032] A magnetic stripping device 123 is provided between the bidirectional auger 115 and the grinding roller 18. The magnetic stripping device 123 is existing technology, and its specific structural design will not be described in detail here. The magnetic stripping device 123 is driven by a servo motor 15 fixedly installed on the side wall of the outer casing 1, and is used to remove impurities such as iron nails from the raw material.

[0033] The outer side of the grinding disc 19 is provided with an air trough 113. The air trough 113 is arranged around the cavity below the grinding disc 19. The air trough 113 is connected to the air inlet 17 installed on the side wall of the outer shell 1. The end of the air inlet 17 away from the air trough 113 is connected to the external hot air supply equipment, so that when hot air is blown into the interior of the outer shell 1 through the air inlet 17, the hot air is continuously blown upward from the air trough 113. Under the action of the wind, the small raw material particles are blown up and moved upward.

[0034] An upper shell 2 is located inside the outer shell 1, and the upper shell 2 is funnel-shaped. A vertically designed return cylinder 22 is fixedly installed in the middle of the upper shell 2. The return cylinder 22 is vertically continuous, and its inner wall is equipped with cooling plates (not shown in the figure). A motor 3 21 is fixedly installed in the middle of the top wall of the outer shell 1. The output end of the motor 3 21 is connected to a fan 23 through a connecting shaft. The fan 23 is located inside the upper part of the return cylinder 22. A plate 1 26 is fixedly connected to the outer side of the upper part of the return cylinder 22. The plate 1 26 is connected to a slight positive voltage for adsorbing the dried raw material. A first annular plate is fixedly installed on the outer side of the upper end of the plate 1 26. There is a gap between the top of the first annular plate and the top wall of the outer shell 1. A material drop trough 28 is provided between the first annular plate and the outer wall of the return cylinder 22. The unit is equipped with several scrapers 27, and the tops of the scrapers 27 are fixedly connected to an internal gear ring 211. A bearing 212 is installed on the outside of the internal gear ring 211, and multiple gears 210 are meshed on the inside. Gears 29 are meshed between the multiple gears 210. Gears 29 are fixedly connected to the output end of the motor 21. Gears 29, gears 210 and internal gear ring 211 form a planetary reducer structure, so that the internal gear ring 211 drives the multiple scrapers 27 to rotate synchronously while rotating. A material pipe 122 is connected to one side of the lower end of the scraper 26. The material pipe 122 is connected to the inside of the material chute 28. The end of the material pipe 122 is connected to the auger conveyor 14 located on the outside of the outer shell 1. The end of the auger conveyor 14 is connected to the discharge pipe 13.

[0035] A second annular plate is fixedly installed on the inner top wall of the outer shell 1 on the outer side of the first annular plate. A metal mesh 25 is provided between the second annular plate and the first plate 26. The first plate 26 and the metal mesh 25 are connected by an insulator. The metal mesh 25 is connected to a negative voltage. Multiple air guide plates 24 are fixedly installed between the second annular plate and the top of the upper shell 2. The air guide plates 24 are designed with a certain angle of inclination so that hot air can swirl when passing through the air guide plates 24.

[0036] In use, the processed and properly moistened cement raw materials enter the outer casing 1 through the feed pipe 12 and fall into the material cylinder 116. The motor 11, after being reduced in speed by a reducer, drives the grinding disc 19 to rotate at a constant speed via the bevel gear structure 112. The grinding disc 19 rotates around the column 111 with the support of the bearing 117. The top of the column 111 is designed in a conical shape for guiding the cement raw materials. Evenly distributed toothed plates are provided on the conical surface of the column 111 and inside the material cylinder 116. As the grinding disc 19 rotates, it continuously grinds the cement raw materials... The raw cement meal, broken into small particles and ultimately of roughly the same size and meeting the requirements, is discharged from the discharge port 119 into the trough 120 inside the hood 110. The hood 110 is rotatably connected to the outer wall of the cylinder 116 via bearing 118. When the grinding disc 19 rotates, the hood 110 and its components remain fixed. The hood 110 has a discharge port 121. The raw cement meal is driven by the rotating grinding disc 19, and under the action of centrifugal force, the raw cement meal in the trough 120 continuously moves outward, and the discharge port 121 continuously discharges the raw cement meal. A limiting plate 133 is provided outside the hood 110. The distance from the bottom of the limiting plate 133 to the top surface of the grinding disc 19 is slightly greater than the height of the discharge port 119. The raw cement meal enters the bottom of the grinding roller 18 through the bottom of the limiting plate 133 and is ground. The limiting plate 133 prevents the raw cement meal from piling up, causing height changes that could lead to vibration and affect grinding quality.

[0037] Driven by motor 16, the bidirectional auger 115 rotates continuously. The outermost part of the auger 115 scrapes away the large raw material particles blocked by the filter screen 114 and conveys them inward, ensuring the unobstructed flow of the filter screen 114 and the re-grinding of the large raw material particles. The bidirectional auger 115 continuously feeds the raw material to ensure that the raw material passing through the limit plate 133 is uniform and there will be no sudden loss of raw material. This prevents the grinding roller 18 and the grinding disc 19 from contacting and vibrating due to sudden material shortage, ensuring the life of the grinding roller 18 and the grinding disc 19 and the grinding quality. Under the influence of centrifugal force, the raw material moves outward continuously. The raw material that has been ground into small particles finally reaches the filter screen 114. The large particles are blocked, and the small particles pass through, avoiding the raw material from falling directly into the air duct 113 and causing material leakage and waste.

[0038] Hot air is blown into the outer shell 1 through the air inlet 17 and continuously blown upward from the air duct 113. Under the action of the wind, the small raw material particles are blown upward and moved upward. During this process, the moisture on the small raw material particles evaporates rapidly under the influence of the hot air. Finally, the hot air carries the raw material into the upper shell 2. First, the hot air passes through the guide plate 24 set at a certain angle and makes it swirl. Under the action of swirl, the large raw material particles are thrown to the outside and fall into the material cylinder 116. The small raw material particles, which are less affected by centrifugal force, pass through the negatively charged metal mesh 25 and reach the upper part of the return material cylinder 22. During this process, the raw material is negatively charged. The motor 21 drives the fan 23 to rotate at high speed in the return material cylinder 22 to maintain a negative pressure in the upper part of the return material cylinder 22. Under the action of negative pressure, the hot air carries the raw material into the return material cylinder 22. The plate 26 is connected to a slight positive charge. The dry raw material falls onto the plate due to the adsorption force. On the 116, the damp raw material, due to its lack of charge or insufficient charge, is not easily affected by the slightly positive charge adsorption force and enters the return cylinder 22 along with the hot air. The cooling plates on the inner wall of the return cylinder 22 continuously condense the incoming airflow. The water droplets generated after condensation fall into the material cylinder 116 along with the damp raw material. Due to the heat generated by the hot air in the feed pipe 12, some moisture in the cement raw material is evaporated during its entry. This is replenished by the falling condensate. Finally, the excess water moves outward under the action of centrifugal force and is thrown out into the bottom of the air trough 113. The gear 29 rotating with the fan 23 reduces the speed through the gear 210, causing the internal gear ring 211 to rotate slowly. This causes the scraper 27 to rotate continuously in the discharge trough 28, scraping the raw material into the scraper pipe 122. Under the conveying of the auger conveyor 14, the dry raw material falls out from the discharge pipe 13.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vertical roller mill for cement raw materials, comprising a shell (1), characterized in that, A feed pipe (12) is connected to the upper side of the outer shell (1). A column (111) is fixedly installed on the bottom wall of the inner shell (1). A grinding disc (19) is installed on the outer side of the column (111) through a bearing (117). The grinding disc (19) is driven to rotate by a drive mechanism located below it. A material cylinder (116) is fixedly connected to the top surface of the grinding disc (19) on the outer side of the top of the column (111). The end of the feed pipe (12) is located above the material cylinder (116). A crushing mechanism is provided between the column (111) and the material cylinder (116). A filter screen (114) is detachably installed on the outer periphery of the top of the grinding disc (19) for filtering the raw material after it has been crushed by the crushing mechanism. An air groove (113) is provided on the outer side of the grinding disc (19). The air groove (113) is connected to an air inlet (17) installed on the side wall of the outer shell (1). The end of the air inlet (17) away from the air groove (113) is connected to an external hot air supply device. The outer shell (1) has an upper shell (2) inside, and the upper shell (2) has a drying and separation mechanism inside, which is used to return large raw material particles to the material cylinder (116) and at the same time transport the dried small material particles to the outside of the outer shell (1).

2. The vertical roller mill for cement raw materials according to claim 1, characterized in that, The drive mechanism includes a cavity between the grinding disc (19) and the inner bottom wall of the outer shell (1). The cavity is provided with a bevel gear structure (112). The bevel gear structure (112) includes a driven gear fixedly installed on the bottom surface of the grinding disc (19) and a drive gear meshing with the driven gear. The drive gear is driven by a motor (11) located on the outside of the outer shell (1). The output end of the motor (11) is connected to the drive gear through a reducer.

3. The vertical roller mill for cement raw materials according to claim 1, characterized in that, The crushing mechanism includes toothed plates on the top surface of the column (111) and the inner side wall of the cylinder (116). The top of the column (111) is located above the grinding disc (19). The toothed plates on the column (111) and the cylinder (116) are staggered. Multiple discharge ports (119) are opened at equal angles at the bottom of the side wall of the cylinder (116). A material cover (110) is installed below the side wall of the cylinder (116) through a bearing (118). The lower end of the material cover (110) is fixedly connected to the top of the grinding disc (19). Multiple discharge ports (121) are opened at equal angles at the bottom of the side wall of the material cover (110). A material trough (120) is formed between the inside of the material cover (110), the cylinder (116), and the grinding disc (19).

4. The cement raw material vertical roller mill according to claim 3, characterized in that, The top of the column (111) is tapered, and the inner diameter of the barrel (116) is larger at the top and smaller at the bottom.

5. The vertical roller mill for cement raw materials according to claim 1, characterized in that, The drying and separation mechanism includes a return cylinder (22) fixedly installed in the middle of the upper shell (2). A motor (21) is fixedly installed in the middle of the top wall of the outer shell (1). The output end of the motor (21) is connected to a fan (23) via a connecting shaft. The fan (23) is located above the inside of the return cylinder (22). A plate (26) is fixedly connected to the outer side of the upper part of the return cylinder (22). The plate (26) is connected to a micro positive current. A first annular plate is fixedly installed on the outer side of the upper end of the plate (26). A gap is provided between the top of the first annular plate and the top wall of the outer shell (1). A material drop trough (28) is provided between an annular plate and the outer wall of the return cylinder (22). The material drop trough (28) is provided with a scraping component inside and a conveying component connected to the lower end. A second annular plate is fixedly installed on the inner top wall of the outer shell (1) on the outer side of the first annular plate. A metal mesh (25) is provided between the second annular plate and the first plate (26). The first plate (26) and the metal mesh (25) are connected by an insulator. The metal mesh (25) is connected to a negative voltage. Multiple air guide plates (24) are fixedly installed between the second annular plate and the top of the upper shell (2). The air guide plates (24) are designed with a certain angle of inclination.

6. The vertical roller mill for cement raw materials according to claim 5, characterized in that, The inner wall of the return cylinder (22) is equipped with a cooling plate to condense the gas entering the return cylinder (22) so that the generated water droplets flow back into the cylinder (116).

7. The vertical roller mill for cement raw materials according to claim 5, characterized in that, The scraping assembly includes multiple scrapers (27) located inside the material chute (28). The top ends of the multiple scrapers (27) are fixedly connected to an internal gear ring (211). A bearing three (212) is installed on the outside of the internal gear ring (211), and multiple gear two (210) are meshed on the inside. A gear one (29) is meshed between the multiple gear two (210). The gear one (29) is fixedly connected to the output end of the motor three (21). The gear one (29), gear two (210) and internal gear ring (211) form a planetary reducer structure, so that the internal gear ring (211) drives the multiple scrapers (27) to rotate synchronously while rotating.

8. The vertical roller mill for cement raw materials according to claim 5, characterized in that, The conveying assembly includes a material pipe (122) that communicates with the inside of the material chute (28). The end of the material pipe (122) is connected to an auger conveyor (14) located on the outside of the housing (1). The end of the auger conveyor (14) is connected to a discharge pipe (13).

9. The vertical roller mill for cement raw materials according to claim 3, characterized in that, A bidirectional auger (115) is rotatably installed between each of the discharge ports (121) and the filter screen (114). The bidirectional auger (115) conveys the material at its head and tail to the middle. The bidirectional auger (115) is driven by a motor (16) fixedly installed on the outer wall of the outer shell (1). A limiting plate (133) is fixedly installed between the material cover (110) and the filter screen (114) on one side of the bidirectional auger (115). The distance from the bottom of the limiting plate (133) to the top surface of the grinding disc (19) is slightly greater than the height of the discharge port (119). A grinding roller (18) is rotatably connected to the side of the limiting plate (133) away from the bidirectional auger (115). The grinding roller (18) is in rotatable contact with the top surface of the grinding disc (19).

10. The vertical roller mill for cement raw materials according to claim 9, characterized in that, An iron removal device (123) is provided between the bidirectional auger (115) and the grinding roller (18). The iron removal device (123) is driven by a servo motor (15) fixedly installed on the side wall of the outer casing (1) and is used to remove iron impurities from the raw material.

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