Vertical mill

Abstract

This vertical mill 100 comprises: a housing 110 that includes a cylindrical body part 112, an opening 116 formed on a side surface 112b of the body part, and a cover 118 that closes the opening and is protruded outward from the body part; a pulverization table 120 provided in the body part of the housing; a roller unit 130 that is provided in the housing and includes a pulverization roller 132 rotatably provided above the pulverization table in the body part of the housing, a roller shaft 134 rotatably supporting the pulverization roller, and a bracket 136 into which the roller shaft is inserted, a portion of the bracket being provided inside the cover of the housing; a pressurizing device 140 that passes through the cover of the housing and presses the bracket of the roller unit toward the pulverization table; and a cover plate 200 that is provided closer to the body part side than the cover of the housing and covers at least a portion of the opening of the housing.

Description

Vertical Mill

[0001] This application claims the benefit of priority from Japanese Patent Application No. 2024-148188, filed on August 30, 2024, the contents of which are incorporated herein by reference.

[0002] Vertical mills are widely used to pulverize materials such as coal, biomass, and cement raw materials. Vertical mills include a grinding table, grinding rollers, and an airflow generating unit. In vertical mills, the material is fed between the grinding table and the grinding rollers. The material is then crushed by the grinding rollers on the grinding table and pulverized. Furthermore, in vertical mills, the airflow generating unit generates an ascending airflow from the grinding table toward the discharge port. The pulverized material then rides the ascending airflow, moving from the grinding table to the discharge port and being discharged out of the vertical mill through the discharge port.

[0003] As an example of such a vertical mill, Patent Document 1 discloses a vertical mill that includes a roller unit including a crushing roller and a biasing device that applies a load to the roller unit.

[0004] JP 2014-121665 A

[0005] As shown in the above-mentioned Patent Document 1, in a vertical mill, a part of the housing protrudes outward to accommodate the rod and rod holder that constitute the roller unit, and the arm that constitutes the biasing device.

[0006] The cross-sectional area of ​​the airflow path (flow passage cross-sectional area) is larger in the protruding part of the housing than in the other parts of the housing. This causes the speed of the ascending air current to decrease in the protruding part of the housing. This causes a problem in the vertical mill, which is that the amount of material discharged per unit time to be ground decreases.

[0007] In view of the above problems, the present disclosure aims to provide a vertical mill that can prevent a decrease in the amount of material discharged per unit time.

[0008] In order to solve the above problems, a vertical mill according to one embodiment of the present disclosure comprises a housing including a cylindrical main body, an opening formed on a side of the main body, and a cover that covers the opening and protrudes outward from the main body, a grinding table provided within the main body of the housing, a grinding roller rotatably provided above the grinding table within the main body of the housing, a roller shaft that rotatably supports the grinding roller, and a bracket through which the roller shaft is inserted, a portion of which is provided within the housing cover, a roller unit provided within the housing, a pressure device that penetrates the housing cover and presses the bracket of the roller unit toward the grinding table, and a cover plate that is provided on the main body side of the housing cover and covers at least a portion of the opening of the housing.

[0009] The vertical mill may also include a flexible and heat-resistant filler material that fills the space formed between the cover and the covering plate.

[0010] The cover plate may also be formed with a first opening into which the pressure device is fitted.

[0011] The cover plate may also be formed with a second opening into which the bracket of the roller unit is fitted.

[0012] The cover plate may also cover at least an upper portion of the opening in the housing.

[0013] According to the present disclosure, it is possible to prevent a decrease in the amount of material discharged per unit time.

[0014] Figure 1 is a schematic diagram of a vertical mill according to an embodiment of the present disclosure, Figure 2 is a partially enlarged view of Figure 1, Figure 3 is a front view of a covering plate according to the embodiment, and Figure 4 is a front view of a deposition prevention plate according to the embodiment.

[0015] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Dimensions, materials, and other specific numerical values ​​shown in the embodiments are merely examples for ease of understanding and do not limit the present disclosure unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation. Elements not directly related to the present disclosure are not shown.

[0016] [1. Overview of the Vertical Mill] First, an overview of a vertical mill 100 according to an embodiment of the present disclosure will be described with reference to FIG. 1. FIG. 1 is a schematic diagram of a vertical mill 100 according to this embodiment. In FIG. 1, solid arrows indicate the flow of the material to be ground and the solid-gas two-phase flow. In addition, dashed arrows in FIG. 1 indicate the flow of gas. Note that in the following figures, including FIG. 1 of this embodiment, the X-axis, Y-axis, and Z-axis, which intersect perpendicularly, are defined as shown. Note that the X-axis and Y-axis indicate the horizontal direction, and the Z-axis indicates the vertical direction.

[0017] 1, the vertical mill 100 according to this embodiment includes, for example, a housing 110, a grinding table 120, one or more roller units 130, one or more pressure devices 140, a supply pipe 150, an outlet 160, an outlet 170, an airflow forming section 180, a rotary classifier 190, and a covering plate 200. For ease of understanding, only one roller unit 130 and one pressure device 140 are shown in FIG. 1, and the other roller units 130 and pressure devices 140 are omitted.

[0018] The housing 110 has a cylindrical shape. For example, the housing 110 has a substantially cylindrical shape. The housing 110 is provided such that the axial direction of the housing 110 is aligned vertically or substantially vertically.

[0019] The housing 110 includes a main body 112, a distribution section 114, an opening 116, and a cover 118. The main body 112 is tubular. The main body 112 is, for example, substantially cylindrical. The inner diameter of the main body 112 is substantially constant along the vertical direction. The distribution section 114 communicates with the upper part of the main body 112. The inner diameter of the distribution section 114 gradually increases from the bottom to the top. In other words, the flow path cross-sectional area of ​​the distribution section 114 gradually increases from the bottom to the top. Note that the communication point 112a between the main body 112 and the distribution section 114 is, for example, smaller than the inner diameter of the main body 112.

[0020] The opening 116 is formed in the side surface 112b of the main body 112. The opening 116 is formed, for example, above the rotary table 120 in the main body 112. The size of the opening 116 is large enough to allow the roller unit 130 and pressure device 140, which will be described later, to pass through.

[0021] The cover 118 is also called a journal cover. The cover 118 closes the opening 116. The cover 118 protrudes outward from the main body 112. The cover 118 is configured to be able to open and close the opening 116, for example. In this embodiment, the cover 118 opens and closes the opening 116 by rotating about a rotation shaft 118a. The rotation shaft 118a extends, for example, horizontally or approximately horizontally.

[0022] The grinding table 120 is provided within the main body 112 of the housing 110. The horizontal cross section of the grinding table 120 is circular. The grinding table 120 is, for example, disk-shaped. The grinding table 120 is provided within the housing 110 so that its rotation axis is vertical. The grinding table 120 is rotated by a table drive motor 124 via a reducer 122. The grinding table 120 is rotated by the table drive motor 124 at a constant speed or a variable speed.

[0023] A groove 126 is formed on the upper surface of the rotary table 120. The groove 126 is an annular groove centered on the rotation axis of the rotary table 120. A vertical cross section of the groove 126 passing through the rotation axis of the rotary table 120 is arc-shaped.

[0024] The roller unit 130 is provided within the housing 110. One or more roller units 130 may be provided. For example, three roller units 130 may be provided. The roller unit 130 includes a crushing roller 132, a roller shaft 134, a bracket 136, and a pivot shaft 138. The crushing roller 132 is rotatably provided above the crushing table 120 within the main body 112 of the housing 110. The crushing roller 132 is, for example, arranged at an incline above the groove 126 of the crushing table 120. The more material to be crushed is guided into the groove 126, the smaller the inclination of the crushing roller 132 (approaching horizontal), and the fewer material to be crushed is guided into the groove 126, the greater the inclination of the crushing roller 132. The crushing roller 132 rotates in conjunction with the rotation of the crushing table 120. More specifically, as the grinding table 120 rotates, the material to be crushed on the grinding table 120 rotates and moves together with the grinding table 120. As the material to be crushed moves, frictional force generated between the material to be crushed and the grinding roller 132 causes the grinding roller 132 to rotate.

[0025] In this embodiment, three crushing rollers 132 are provided radially at 120° intervals from the rotation center of the crushing table 120. The crushing rollers 132 are rotatably supported by bearings (not shown) attached to roller shafts 134. The roller shafts 134 are inserted into a bracket 136. The bracket 136 is provided through the opening 116, extending from the inside of the cover 118 of the housing 110 to the inside of the main body 112. In addition to the roller shafts 134, a pivot shaft 138 is also inserted into the bracket 136. The pivot shaft 138 is supported by bearings (not shown).

[0026] One pressure device 140 is provided for each roller unit 130. In this embodiment, the vertical mill 100 has three roller units 130, and therefore three pressure devices 140 are provided. The pressure devices 140 penetrate the cover 118 of the housing 110. The pressure devices 140 include an actuator. The actuator is, for example, a hydraulic cylinder. The pressure devices 140 press the grinding roller 132 toward the grinding table 120. In this embodiment, the pressure devices 140 press against a receiving seat 136a formed on the bracket 136. This applies a load to the receiving seat 136a. This causes the bracket 136 to swing around the pivot shaft 138 as the center of rotation. The grinding roller 132 swings together with the bracket 136 and is pressed downward toward the grinding table 120.

[0027] The supply pipe 150 is cylindrical. The supply pipe 150 is inserted through the upper wall 112c of the housing 110 so that its axial direction is vertical or approximately vertical. In this embodiment, the supply pipe 150 is inserted through the housing 110 so as to be coaxial with the housing 110. Also, in this embodiment, the supply pipe 150 is inserted through the housing 110 so as to be coaxial with the rotation axis of the grinding table 120. An upper opening of the supply pipe 150 is located outside the housing 110. A lower opening of the supply pipe 150 faces the grinding table 120 provided inside the housing 110. A material to be ground supply device (not shown) is connected to the upper opening of the supply pipe 150. The material to be ground is supplied onto the grinding table 120 by the material to be ground through the supply pipe 150.

[0028] The material to be crushed is, for example, solid fuel such as coal or biomass pellets. The biomass is, for example, one or more of woody biomass, herbaceous biomass, and waste-based biomass. Woody biomass is, for example, wood, sawdust, bark, etc. Herbaceous (plant) biomass is, for example, sugarcane, sorghum, bamboo, wheat straw, rice straw, etc. Waste-based biomass is, for example, empty fruit bunches (EFBs) and palm kernel shells (PKSs) that are generated as a result of producing palm oil from palm trees.

[0029] The discharge port 160 is formed in the housing 110 above the grinding roller 132. The discharge port 160 is formed, for example, in the upper wall 112c of the housing 110. Therefore, the distributor 114 is provided between the grinding roller 132 and the discharge port 160. In this embodiment, the vertical mill 100 has multiple discharge ports 160. The multiple discharge ports 160 are formed in the upper wall 112c of the housing 110 at approximately equal intervals along the circumferential direction of the housing 110. A discharge pipe 162 is connected to the discharge port 160. The discharge pipe 162 discharges the material ground by the grinding table 120 and the grinding roller 132 to the outside. The discharge pipe 162 is connected, for example, to a combustion port of a furnace that constitutes a power generation device.

[0030] The air outlets 170 are provided on the outer edge or outside the outer edge of the grinding table 120. In this embodiment, the vertical mill 100 is equipped with a plurality of air outlets 170. The plurality of air outlets 170 are provided outside the outer edge of the grinding table 120 and are formed at approximately equal intervals along the outer edge of the grinding table 120.

[0031] The airflow forming unit 180 forms an airflow from the air outlet 170 toward the exhaust port 160 within the housing 110. That is, the airflow forming unit 180 forms an ascending air current within the housing 110. The airflow forming unit 180 includes, for example, a blower that supplies gas to the air outlet 170. The gas supplied by the airflow forming unit 180 is, for example, air, combustion exhaust gas, or nitrogen. Note that the configuration of the airflow forming unit 180 is not limited as long as it can form an airflow from the air outlet 170 toward the exhaust port 160 within the housing 110. The airflow forming unit 180 may include, for example, a blower that sucks gas from the exhaust port 160 instead of or in addition to the blower that supplies gas to the air outlet 170 described above.

[0032] In this embodiment, the vertical mill 100 may also include a rotary classifier 190. The rotary classifier 190 is provided within the main body 112 of the housing 110. The rotary classifier 190 includes, for example, a rotary rotor 192 and a plurality of blades 194. The rotary rotor 192 is an annular member provided to surround the outer periphery of the supply pipe 150. The plurality of blades 194 are provided at approximately equal intervals around the circumferential direction of the rotary rotor 192. The rotary rotor 192 is rotated by a drive device (not shown). The rotation of the rotary rotor 192 rotates the plurality of blades 194. Note that, as will be described in detail later, in this embodiment, the rotation of the rotary rotor 192 may be stopped. Furthermore, the plurality of blades 194 may be removed.

[0033] The cover plate 200 is provided closer to the main body 112 than the cover 118 of the housing 110. The cover plate 200 covers at least a portion of the opening 116 of the housing 110.

[0034] In this embodiment, the vertical mill 100 may also include one or both of a deposition prevention plate 210 and a filler material 220. The deposition prevention plate 210 is provided inside the cover 118 of the housing 110. The filler material 220 is filled in a space formed between the cover 118 and the covering plate 200.

[0035] The cover plate 200, the deposition prevention plate 210, and the filler 220 will be described in detail later.

[0036] 2. Operation of the Vertical Mill Next, the operation of the vertical mill 100 according to this embodiment will be described with reference to Fig. 1. First, the material to be crushed is supplied onto the crushing table 120 through the supply pipe 150 by the material to be crushed supply device.

[0037] The material to be crushed supplied to the crushing table 120 is caught between the recessed groove 126 of the crushing table 120 and the crushing roller 132. As the crushing table 120 rotates, the caught material to be crushed is crushed by the crushing roller 132 and crushed.

[0038] The pulverized material then rises within the main body 112 of the housing 110 together with the gas blown out through the outlet 170 by the airflow forming section 180. In other words, the pulverized material rises within the main body 112 of the housing 110 in a solid-gas two-phase flow state. The pulverized material then passes through the rotary classifier 190 and is transported by airflow to the distributor 114 of the housing 110.

[0039] As described above, the inner diameter of the distribution section 114 gradually increases from bottom to top. Therefore, the flow rate of the gas-solid two-phase flow transported to the distribution section 114 gradually decreases from bottom to top. This allows a vortex to be formed within the distribution section 114. The material to be pulverized is then efficiently dispersed within the distribution section 114 by the vortex. Therefore, the material to be pulverized is distributed approximately uniformly to the multiple discharge ports 160. The material to be pulverized distributed to the multiple discharge ports 160 is then discharged to the outside through the discharge pipe 162.

[0040] [3. Covering Plate] Next, details of the covering plate 200 according to this embodiment will be described with reference to Figures 2 and 3. Figure 2 is a partially enlarged view of Figure 1. Figure 3 is a front view of the covering plate 200 according to this embodiment. Note that the fixing member 202 is omitted from Figure 2 for ease of understanding. Also, in Figure 3, the cross section of the bracket 136 and the cross section of the pressure device 140 in the YZ plane, which includes the surface of the covering plate 200 facing the inside of the housing 110, are indicated by dashed lines. In Figure 3, the opening 116 is indicated by a dashed line.

[0041] As described above, cover 118 of housing 110 protrudes outward from main body 112 (in the −X direction in FIG. 2 ) to ensure space for accommodating part of roller unit 130 and part of pressure device 140. For this reason, the cross-sectional area (flow path cross-sectional area) of the airflow path in the portion of housing 110 where cover 118 is provided is larger than the airflow path formed within main body 112. Therefore, the speed of the ascending air current decreases in the portion of housing 110 where cover 118 is provided.

[0042] When coal is supplied to a furnace that constitutes a power generation apparatus, the target particle size of the coal required for the furnace is, for example, about 40 μm. Therefore, in a vertical mill designed for pulverizing coal, the speed of the updraft within main body 112 of housing 110, the speed of the updraft in the portion of housing 110 where cover 118 is provided, and the rotation speed of the rotary classifier are determined so that particles having a particle size of about 40 μm are discharged from the discharge port.

[0043] On the other hand, when biomass is supplied to a furnace constituting a power generation apparatus, the target particle size of the biomass required for the furnace is, for example, 500 μm or more and 700 μm or less. That is, the target particle size of the biomass in the furnace is larger than the target particle size of coal, for example, 15 times or more the target particle size of coal. Therefore, when biomass is pulverized using a vertical mill designed for pulverizing coal, even if the biomass is pulverized to the target particle size, it may remain in the portion of the housing 110 where the cover 118 is provided, making it difficult to transport by airflow to the discharge port. In other words, when biomass is pulverized using a vertical mill designed for pulverizing coal, if the biomass is not pulverized to the target particle size of coal, it will be difficult to transport by airflow to the discharge port.

[0044] Therefore, the vertical mill 100 according to this embodiment includes a cover plate 200. As shown in FIGS. 2 and 3, the cover plate 200 is provided within the cover 118 of the housing 110. In this embodiment, the cover plate 200 covers at least the upper portion of the opening 116 of the housing 110. The upper portion is, for example, from the upper end of the opening 116 of the housing 110 to 50%, preferably up to 70%, more preferably up to 80%, and even more preferably up to 90% of the vertical length of the opening 116 (the -Z direction in FIGS. 2 and 3). Note that the cover plate 200 is not limited to a specific portion of the opening 116 of the housing 110, as long as it can cover at least a portion of the opening 116. For example, the cover plate 200 may cover a lower portion of the opening 116 of the housing 110. Furthermore, for example, the cover plate 200 may cover the entire opening 116 of the housing 110. For example, the cover plate 200 may cover the side of the opening 116 of the housing 110 (the end in the Y direction in FIG. 2).

[0045] 3, the cover plate 200 is fixed to the cover 118 of the housing 110 by a fixing member 202. The fixing member 202 includes, for example, an L-shaped angle (an angle iron) and a bolt.

[0046] The surface of the covering plate 200 facing inward of the housing 110 (the surface disposed in the +X direction in FIG. 2 ) is flush with, for example, the inner circumferential surface of the main body 112 of the housing 110. Note that the surface of the covering plate 200 facing inward of the housing 110 may be disposed outward (toward the cover 118) than the inner circumferential surface of the main body 112 of the housing 110.

[0047] The cover plate 200 is fixed to the cover 118 of the housing 110 so as to be aligned, for example, in the vertical direction (Z direction in FIG. 2) or approximately in the vertical direction.

[0048] As shown in FIGS. 2 and 3, in this embodiment, the cover plate 200 preferably has a first opening 204 and a second opening 206 formed therein.

[0049] The pressure device 140 is fitted into the first opening 204. For example, if the pressure device 140 has two hydraulic cylinders, two first openings 204 are formed in the covering plate 200. The bracket 136 of the roller unit 130 is fitted into the second opening 206.

[0050] One or both of the first opening 204 and the second opening 206 are holes or notches. In this embodiment, the first opening 204 and the second opening 206 are notches that communicate with each other. This improves workability when forming the first opening 204 and the second opening 206 in the covering plate 200.

[0051] 2 to 4, the deposition prevention plate 210 according to this embodiment will be described in detail. Fig. 4 is a front view of the deposition prevention plate 210 according to this embodiment. In Fig. 4, the cross section of the bracket 136 in the YZ plane, which includes the surface of the covering plate 200 facing the inside of the housing 110, is indicated by a dashed line. In Fig. 4, the opening 116 is indicated by a dashed line.

[0052] The deposition prevention plate 210 is provided within the cover 118 of the housing 110. In this embodiment, the deposition prevention plate 210 covers at least a lower portion of the opening 116 of the housing 110. The deposition prevention plate 210 is provided below the pressure device 140 within the cover 118. The deposition prevention plate 210 slopes downward from the cover 118 toward the main body 112.

[0053] 4, a third opening 212 is formed in the accumulation prevention plate 210. A bracket of the roller unit 130 is fitted into the third opening 212. The third opening 212 is a hole or a notch.

[0054] The lower end of the deposition prevention plate 210 is provided outward from the air outlet 170. The lower end of the deposition prevention plate 210 may be in contact with the lower end of the covering plate 200. A gap may be formed between the lower end of the deposition prevention plate 210 and the lower end of the covering plate 200 to a degree that prevents the filler material 220, which will be described later, from falling.

[0055] The vertical mill 100 according to this embodiment is provided with an anti-accumulation plate 210, which can prevent the intrusion of the material to be ground into the cover 118 through a gap formed below the covering plate 200, together with the filler material 220 described below. Furthermore, the vertical mill 100 according to this embodiment is provided with the anti-accumulation plate 210, which can prevent the filler material 220 from falling.

[0056] 5. Filler Next, the filler 220 according to this embodiment will be described with reference to FIG.

[0057] The filler material 220 is filled, for example, in a space formed between the cover 118 of the housing 110 and the covering plate 200. In this embodiment, the filler material 220 is filled in a space formed between the covering plate 200 and the deposition prevention plate 210 within the cover 118 of the housing 110.

[0058] The filler 220 is made of a flexible and heat-resistant material. Here, flexibility refers to the ability to follow the movement of the bracket 136 of the roller unit 130. In this embodiment, flexibility is synonymous with at least one of, for example, deformability, restorability, and flexibility. Heat resistance refers to the ability to maintain flexibility when exposed to, for example, approximately 100°C. The filler 220 is, for example, fibrous glass (glass wool), fibrous heat-resistant resin, or a sponge made of heat-resistant resin.

[0059] [6. Summary] As described above, the vertical mill 100 according to this embodiment comprises a housing 110 including a cylindrical main body 112, an opening 116 formed in a side surface 112b of the main body 112, and a cover 118 that closes the opening 116 and protrudes outward from the main body 112; a grinding table 120 provided within the main body 112 of the housing 110; a grinding roller 132 rotatably provided above the grinding table 120 within the main body 112 of the housing 110; and a roller shaft that rotatably supports the grinding roller 132. the roller shaft 134 is inserted through the roller unit 130, and a bracket 136 is provided in the cover 118 of the housing 110, and a roller unit 130 is provided in the housing 110, the roller shaft 134 is inserted through the roller unit 130, and a portion of the bracket 136 is provided in the cover 118 of the housing 110; a pressure device 140 that penetrates the cover 118 of the housing 110 and presses the bracket 136 of the roller unit 130 toward the grinding table 120; and a cover plate 200 that is provided closer to the main body 112 than the cover 118 of the housing 110 and covers at least a portion of the opening 116 of the housing 110.

[0060] The vertical mill 100 according to this embodiment includes the covering plate 200, which reduces the cross-sectional area of ​​the airflow path in the portion of the housing 110 where the cover 118 is provided, compared to a conventional vertical mill not including the covering plate 200. Therefore, in the vertical mill 100 according to this embodiment, the speed of the ascending air current is increased in the portion of the housing 110 where the cover 118 is provided. As a result, when grinding biomass pellets, the vertical mill 100 according to this embodiment can suitably transport biomass ground to a target particle size from the grinding table 120 to the discharge outlet by airflow. Therefore, the vertical mill 100 according to this embodiment can increase the amount of biomass discharged per unit time, compared to grinding biomass pellets using a conventional vertical mill not including the covering plate 200. Furthermore, the vertical mill 100 of this embodiment makes it possible to increase the amount of material discharged per unit time, regardless of the type of material to be crushed, compared to when the material is crushed using a conventional vertical mill that does not have a covering plate 200.

[0061] Furthermore, the vertical mill 100 according to this embodiment can prevent the rising air current from flowing toward the cover 118 by using the covering plate 200. In other words, the vertical mill 100 according to this embodiment can guide the rising air current toward the center of the housing 110, for example, toward the rotary classifier 190, by using the covering plate 200. This allows the vertical mill 100 according to this embodiment to further increase the amount of material discharged per unit time.

[0062] Furthermore, the vertical mill 100 according to this embodiment can increase the speed of the ascending air current simply by attaching the covering plate 200 to a conventional vertical mill. Therefore, the vertical mill 100 according to this embodiment can increase the amount of biomass discharged per unit time with simple modifications.

[0063] The vertical mill 100 according to this embodiment may also include a flexible and heat-resistant filler 220 that fills the space formed between the cover 118 and the covering plate 200 .

[0064] As a result, the vertical mill 100 according to this embodiment can prevent the material to be ground from entering the cover 118 through the portion of the opening 116 that is not covered by the cover plate 200. Therefore, the vertical mill 100 according to this embodiment can prevent malfunctions of the roller unit 130 and the pressure device 140 that may be caused by the material to be ground.

[0065] The cover plate 200 may also be formed with a first opening 204 into which the pressure device 140 is fitted.

[0066] As a result, the vertical mill 100 according to this embodiment can close the periphery of the pressure device 140 with the cover plate 200, making it possible to further prevent the material to be ground from entering the cover 118 side.

[0067] The cover plate 200 may also be formed with a second opening 206 into which the bracket 136 of the roller unit 130 is fitted.

[0068] As a result, the vertical mill 100 according to this embodiment can cover the periphery of the bracket 136 of the roller unit 130 with the cover plate 200, further preventing the material to be ground from entering the cover 118 side.

[0069] The cover plate 200 may also cover at least the upper portion of the opening 116 of the housing 110 .

[0070] As a result, the vertical mill 100 according to this embodiment can further increase the amount of material discharged per unit time.

[0071] Although the embodiments have been described above with reference to the accompanying drawings, it goes without saying that the present disclosure is not limited to the above-described embodiments. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present disclosure.

[0072] The present disclosure can contribute, for example, to Sustainable Development Goal (SDG) Goal 7 "Ensure access to affordable, reliable, sustainable and modern energy" and Goal 13 "Take urgent action to combat climate change and its impacts."

[0073] 100: Vertical mill 110: Housing 112: Main body 112b: Side surface 116: Opening 118: Cover 120: Grinding table 130: Roller unit 132: Grinding roller 134: Roller shaft 136: Bracket 140: Pressure device 200: Cover plate 204: First opening 206: Second opening 220: Filler

Claims

1. A vertical mill comprising: a housing including a cylindrical main body, an opening formed in a side of the main body, and a cover that closes the opening and protrudes outward from the main body; a grinding table provided within the main body of the housing; a roller unit provided within the housing, the roller unit including a grinding roller rotatably provided above the grinding table within the main body of the housing, a roller shaft that rotatably supports the grinding roller, and a bracket through which the roller shaft is inserted, a portion of which is provided within the cover of the housing; a pressure device that penetrates the cover of the housing and presses the bracket of the roller unit toward the grinding table; and a cover plate that is provided on the main body side of the cover of the housing and covers at least a portion of the opening of the housing.

2. The vertical mill according to claim 1, further comprising a flexible and heat-resistant filler material filled in the space formed between the cover and the covering plate.

3. A vertical mill according to claim 1 or 2, wherein the covering plate is formed with a first opening into which the pressure device is fitted.

4. A vertical mill according to claim 1 or 2, wherein the covering plate is formed with a second opening into which the bracket of the roller unit is fitted.

5. A vertical mill according to claim 1 or 2, wherein the cover plate covers at least the upper part of the opening in the housing.

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