Pulverization table and pulverization device

Abstract

Provided is a pulverization table (13) comprising: a table liner (13A) on which a pulverization surface (13a) that comes into contact with a pulverization roller is formed; a table body (13B) that is formed in a cylindrical shape so as to extend in a vertical direction (VD), the table liner (13A) being fixed to the upper side of the table body (13B) in the vertical direction (VD), and the lower side of the table body (13B) in the vertical direction (VD) being fixed to a drive device; a hub cover (13C) that is fixed to the upper side of the table body (13B), located on the inner peripheral side of the table liner (13A), and arranged so as to cover the upper side of an internal space (IS) of the table body (13B); and a hub plate (13D) that partitions the internal space (IS) into an upper space (ISu) defined by the hub cover (13C) and a lower space (ISl) defined by the table body (13B).

Description

Pulverizing table and pulverizing apparatus

[0001] The present disclosure relates to a pulverizing table and a pulverizing apparatus.

[0002] Conventionally, there has been known a pulverizing apparatus including a pulverizing table and a pulverizing roller that pulverizes a raw material supplied from a raw material supply unit to the pulverizing table between the pulverizing roller and the pulverizing table (see, for example, Patent Document 1). The pulverizing apparatus disclosed in Patent Document 1 transmits a driving force around a central axis from a driving device to the pulverizing table, and rotates the pulverizing table to pulverize the raw material between the pulverizing table and the pulverizing roller.

[0003] Japanese Unexamined Patent Publication No. 2023-123078

[0004] When reducing the weight of a pulverizing table to reduce material costs while ensuring the strength of the pulverizing table, it is desirable to form the lower side of the pulverizing table into a hollow cylindrical shape. In this case, if a part of the upper portion of the pulverizing table is worn to form a hole, there is a possibility that the raw material may enter the hollow internal space through the hole. If a large amount of the raw material that has entered the internal space accumulates, the raw material may oxidize, increase in temperature, and ignite.

[0005] The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a pulverizing table and a pulverizing apparatus that can prevent a large amount of raw material entering through a hole from accumulating even when a part of a cover covering the internal space of a table body is worn to form a hole.

[0006] To solve the above problems, the present disclosure employs the following means. A grinding table according to one aspect of the present disclosure is a grinding table for grinding raw materials supplied from a raw material supply unit with a grinding roller, comprising: a grinding surface formed in an annular shape around an axis and in contact with the grinding roller; a table body formed in a cylindrical shape extending in a vertical direction along the axis, with the grinding surface formed above in the vertical direction and fixed below in the vertical direction to a drive device that generates a driving force to rotate the grinding surface around the axis; a cover fixed above the table body and positioned on the inner circumference side of the grinding surface, positioned to cover the upper part of the internal space of the table body centered on the axis; and a plate that divides the internal space into an upper space defined by the cover and a lower space defined by the table body.

[0007] According to this disclosure, even if a part of the cover that surrounds the internal space of the table body wears down and a hole is formed, it is possible to provide a grinding table and a grinding apparatus that can prevent a large amount of raw material from accumulating by entering through the hole.

[0008] This is a longitudinal cross-sectional view showing the main components of the pulverizer. This is a perspective view showing a part of the internal components of the pulverizer. This is a longitudinal cross-sectional view of the pulverizing table shown in Figure 2. This is a partial enlarged view of part A shown in Figure 3. This is a longitudinal cross-sectional view showing a first modified example of the pulverizing table. This is a longitudinal cross-sectional view showing a second modified example of the pulverizing table. This is a longitudinal cross-sectional view showing a third modified example of the pulverizing table. This is a longitudinal cross-sectional view showing a fourth modified example of the pulverizing table. This is a longitudinal cross-sectional view showing a fifth modified example of the pulverizing table.

[0009] Hereinafter, an embodiment of this disclosure will be described with reference to the drawings. It should be noted that the embodiment described below is merely illustrative, and there is no intention to exclude various modifications or applications of techniques not explicitly shown in the embodiments below. Each configuration of the embodiments below can be modified in various ways without departing from their spirit, and can be selected or combined as needed.

[0010] Furthermore, the pulverizer (pulverizing device) 10 described herein is for pulverizing raw materials into fine powder, and a typical example is a fine pulverizer (mill) that pulverizes solid fuels such as coal into fine fuel. In addition to the above, the pulverizer can also be used to pulverize other solid fuels such as biomass fuels and petroleum coke, as well as ores.

[0011] Here, biomass fuel refers to renewable, biologically derived organic resources, such as thinned timber, waste wood, driftwood, grass, biological waste, sludge, and recycled fuels (pellets and chips) made from these materials, and is not limited to those listed here. Because biomass fuels absorb carbon dioxide during the growth process of biomass, they do not emit carbon dioxide, which is a greenhouse gas, and are therefore considered carbon neutral, and their use is being explored in various ways.

[0012] [Structure of the Crusher] The structure of the crusher (crushing device) 10 of this embodiment will be described with reference to Figure 1. Figure 1 is a longitudinal cross-sectional view showing the main components of the crusher 10. Figure 2 is a perspective view showing a part of the internal structure of the crusher 10. As shown in Figures 1 and 2, the crusher 10 comprises a housing 11, a drive unit 12, a crushing table 13, an input pipe (raw material supply unit) 14, an inlet port 15, a rotary separator 17, an outlet port 18, and a crushing roller unit 20.

[0013] The housing 11 is a vertical, cylindrical, hollow enclosure. An input pipe (raw material supply section) 14 for feeding raw materials to be crushed, such as solid fuels like coal, is positioned on the central axis C1 of the ceiling portion 11a of the housing 11. A crushing table 13 for crushing the raw materials fed in from the input pipe 14 is positioned directly below the input pipe 14. The crushing table 13 is rotated around the central axis C1 by a drive device 12.

[0014] An annular grinding surface 13a is formed on the vertical upper surface of the grinding table 13, concentric with the central axis C1. Multiple (for example, two or three) grinding rollers 21 are arranged vertically above the grinding surface 13a, facing the grinding surface 13a, at equal intervals in the circumferential direction. Each grinding roller 21 is rotatably supported at the tip of a journal shaft 22, which is positioned to be inclined vertically downward from the peripheral wall 11b of the housing 11 toward the central axis C1.

[0015] The journal shaft 22 is a shaft member that is supported by the journal head 23 and extends along the axis Y1. The grinding roller 21, journal shaft 22, and journal head 23 are included in the grinding roller unit 20. The grinding roller unit 20 is a device that grinds the raw material supplied from the input pipe 14 to the grinding table 13 between the grinding roller unit 20 and the grinding table 13.

[0016] The journal head 23 is provided with pivot pins 24 positioned in the opening 11c of the housing 11 and extending tangentially to the outer circumference of the grinding table 13, with pivot shafts 24 protruding from the housing 11 on both sides (one tangentially and the other). The grinding roller unit 20 is supported on the peripheral wall 11b via the pivot shafts 24 so as to be able to swing in a direction approaching the grinding surface 13a and in a direction moving away from the grinding surface 13a.

[0017] As shown in Figure 1, the journal head 23 has a projection 23a that protrudes vertically downward, and the peripheral wall 11b of the housing 11 is equipped with a stopper 25. The tip of the stopper 25 contacts the projection 23a, restricting the approach of the crushing roller 21 to the crushing surface 13a.

[0018] The crushing roller 21 has a biasing device 26 that applies a load to crush the raw material. The biasing device 26 comprises a hydraulic cylinder 26a fixed to the peripheral wall 11b and a plunger 26b driven axially by the hydraulic cylinder 26a. An arm portion 23b extends from the upper part of the journal head 23, and when the tip of the plunger 26b is pressed against the arm portion 23b, a downward load (facing the crushing surface 13a) is applied to the crushing roller 21 to crush the raw material on the crushing surface 13a.

[0019] An inlet port 15 is provided at the bottom of the housing 11, located below the crushing table 13, into which the conveying gas is supplied. In this embodiment, air pressurized by a blower (not shown) is supplied into the housing 11 as the conveying gas through this inlet port 15, creating a pressurized atmosphere inside the housing 11.

[0020] A rotary separator 17 is provided at the top of the housing 11, located around the outside of the input pipe 14, which classifies the crushed raw material (hereinafter also referred to as powder or crushed material) using a classification blade 16. An outlet port 18 is provided at the top 11a of the housing 11 for discharging the classified crushed material to the outside of the housing 11.

[0021] The raw material crushed by the crushing roller 21 becomes pulverized material, and by driving a blower (not shown) connected to the inlet port 15, conveying gas is sent from the inlet port 15 into the housing 11, and the pulverized material rises while being dried by the upward swirling flow of conveying gas generated by the vane 32a of the conveying gas outlet 32.

[0022] The raised pulverized material is classified by the rotary separator 17 into fine powder smaller than a predetermined particle size and coarse powder larger than a predetermined particle size. The fine powder passes through the rotary separator 17 and is discharged from the outlet port 18 on the flow of the conveying gas, and is transported from the pulverizer to another device (for example, a boiler). The coarse powder is either repelled upon by the classification blades 16 of the rotary separator 17, or falls due to its own weight while rising inside the housing 11, and is returned to the pulverizing table 13 for further pulverization.

[0023] [Structure of the grinding table] Next, the structure of the grinding table 13 will be described with reference to Figures 3 and 4. Figure 3 is a longitudinal cross-sectional view of the grinding table 13 shown in Figure 2. Figure 4 is a partially enlarged view of part A shown in Figure 3. As shown in Figures 3 and 4, the grinding table 13 includes a table liner 13A, a table body 13B, a hub cover 13C, a hub plate 13D, and a wedge ring 13E.

[0024] The table liner 13A is a ring-shaped component formed around a central axis C1. The table liner 13A has a grinding surface 13a that contacts the grinding roller 21. The table liner 13A is fixed above the table body 13B by a wedge ring 13E.

[0025] As shown in Figure 4, a recess 13Aa is formed at the inner circumference end of the table liner 13A. The wedge ring 13E is a member formed in an annular shape around the central axis C1, and has a protrusion 13Ea that projects toward the outer circumference in the radial direction RD perpendicular to the central axis C1. With the protrusion 13Ea of the wedge ring 13E engaged with the recess 13Aa of the table liner 13A, the wedge ring 13E is fixed to the table body 13B by fastening bolts B. This fixes the table liner 13A above the table body 13B.

[0026] The table body 13B is a cylindrical member formed to extend in a vertical direction VD along the central axis C1. The table body 13B has a crushing surface 13a formed by fixing the table liner 13A to the upper part in the vertical direction VD, and the lower part in the vertical direction VD is fixed to the drive device 12. The table body 13B has a housing portion 13B1 for housing and fixing the table liner 13A, a cylindrical portion 13B2 which is formed in a cylindrical shape and has an internal space IS on the central side, and a flange portion 13B3 which protrudes inward from the lower end of the cylindrical portion 13B2 in the vertical direction VD toward the central axis C1.

[0027] Multiple insertion holes 13B3a are formed around the central axis C1 of the flange portion 13B3 for inserting fastening bolts B. The table body 13B is fixed to the drive unit 12 by inserting the fastening bolts B into the insertion holes 13B3a and fastening the fastening bolts B into the fastening holes 12a formed on the upper surface of the drive unit 12.

[0028] The hub cover 13C is a circular member in plan view that is fixed above the table body 13B and positioned on the inner circumference side of the table liner 13A. The hub cover 13C is positioned to cover the upper part of the internal space IS centered on the central axis C1 of the table body 13B. As shown in Figure 4, the hub cover 13C is fixed to the table body 13B by inserting fastening bolts B into insertion holes 13Ca formed in the hub cover 13C and fastening the fastening bolts B into fastening holes 13B1a formed on the upper surface of the housing portion 13B1.

[0029] As shown in Figure 3, the hub cover 13C has a top (first top) 13Cc at the position through which the central axis C1 passes, and has a substantially conical shape in which the height in the vertical direction VD gradually decreases toward the outer circumference in the radial direction RD.

[0030] The hub plate 13D is a plate-shaped member that divides the internal space IS of the table body 13B, centered on the central axis C1, into an upper space ISu defined by the hub cover 13C and a lower space ISl defined by the table body 13B. The hub plate 13D prevents raw material M from being guided from the upper space ISu to the lower space ISl when a part of the hub cover 13C wears away and a hole 13Cb is formed, allowing raw material M to enter the internal space IS through the hole 13Cb. The hub plate 13D is formed flat so as to be positioned on a plane perpendicular to the central axis C1.

[0031] As shown in Figure 3, the outer diameter (first outer diameter) D1 of the lower end of the hub cover 13C is set to be the same as the outer diameter (second outer diameter) D2 of the hub plate 13D. This is because the hub plate 13D is positioned between the lower end of the hub cover 13C and the mounting surface 13B1b (see Figure 4) of the upper end of the table body 13B, and the hub plate 13D is fixed by fastening bolts B.

[0032] Furthermore, the outer diameter D2 of the hub plate 13D may be set so that it is less than or equal to the outer diameter D1 of the hub cover 13C. In this way, the outer diameter D2 will not be larger than the outer diameter D1, so when removing the hub plate 13D, it is not necessary to remove other components on the outer circumference side of the hub cover 13C (for example, the wedge ring 13E or the table liner 13A). Therefore, the work of removing the hub plate 13D can be easily performed.

[0033] As shown in Figure 4, the thickness of the hub plate 13D (second thickness) T2 is set to be thinner than the thickness of the thinnest part of the hub cover 13C (first thickness) T1. In Figure 4, the thickness T2 of the hub plate 13D is constant at each position, but it may be different at each position. In this case, the thickness T2 of the thickest part of the hub plate 13D is set to be thinner than the thickness T1 of the thinnest part of the hub cover 13C.

[0034] As shown in Figure 4, the hub plate 13D is attached to the mounting surface 13B1b at the upper end of the table body 13B with the sealing member 13Da in between. The sealing member 13Da is formed in an annular shape around the central axis C1. The sealing member 13Da prevents moisture and other substances contained in the raw material M from being guided from the upper space ISu to the lower space ISl.

[0035] The pulverizing apparatus of this embodiment described above provides the following functions and effects.

[0036] In the grinding table 13 of this embodiment, a hub cover 13C is positioned to cover the internal space IS of the table body 13B, which is formed in a cylindrical shape and extends in a vertical direction VD along the central axis C1. If a hole 13Cb is formed in the hub cover 13C due to wear caused by contact with the raw material M, there is a risk that the raw material M will enter the internal space IS through the hole 13Cb. In the grinding table 13 of this embodiment, the hub plate 13D divides the internal space IS into an upper space ISu defined by the hub cover 13C and a lower space ISl defined by the table body 13B. Therefore, even if a part of the hub cover 13C wears down and a hole 13Cb is formed, the raw material M entering through the hole 13Cb will not be guided from the upper space ISu to the lower space ISl. Thus, it is possible to prevent a large amount of raw material M from accumulating in the internal space IS.

[0037] According to the grinding table 13 of this embodiment, the thickness T1 of the thinnest part of the hub cover 13C is secured to increase durability against wear due to contact with the raw material M, while the thickness T2 of the hub plate 13D is made thinner than the thickness T1 to reduce the weight of the grinding table 13.

[0038] [First Modification] In the above description, the hub plate 13D is formed in a flat shape so as to be positioned on a plane perpendicular to the central axis C1, but other embodiments are also possible. As shown in Figure 5, the hub plate 13D may have a vertex (second vertex) 13Db at the position through which the central axis C1 passes, and a substantially conical shape in which the height in the vertical direction VD gradually decreases toward the outer circumference in the radial direction RD.

[0039] In this modified version of the grinding table 13, the hub cover 13C is shaped so that the height of the vertical direction VD gradually decreases towards the outer circumference, and the hub plate 13D is shaped so that the height of the vertical direction VD gradually decreases towards the outer circumference, thereby reducing the volume of the upper space ISu and maintaining a small volume of raw material M accumulated in the upper space ISu.

[0040] [Second Modification] The crushing table 13 described above may be provided with a filling member 13F that fills the upper space ISu (see Figure 6). As the filling member 13F shown in Figure 6, for example, sand can be used. With the crushing table 13 of this embodiment, since the filling member 13F fills the upper space ISu, even if a hole 13Cb is formed in the hub cover 13C due to wear, it is possible to prevent raw material M from accumulating in the upper space ISu. Furthermore, by using a non-combustible material for the filling member 13F, it is possible to prevent the hub cover 13C and the like from burning out even if oxidation and temperature rise occur in the raw material M.

[0041] [Third Modification] The crushing table 13 described above may also be provided with a lifting section 13G that is attached to the upper surface of the hub plate 13D and connected to a lifting mechanism 100 that lifts the hub plate 13D upward in the vertical direction VD (see Figure 7). As shown in Figure 7, by connecting the lifting mechanism 100 to the lifting section 13G, the hub plate 13D can be easily lifted upward in the vertical direction VD by the lifting mechanism 100 after the hub cover 13C has been removed.

[0042] [Fourth Modification] In the crushing table 13 described above, as shown in Figure 8, the hub plate 13D has a communication hole 13Dc that connects the upper space and the lower space, and may be provided with a lid 13H that switches between a sealed state and an open state of the communication hole 13Dc.

[0043] As shown in Figure 8, by switching the cover 13H to the open position of the communication hole 13Dc (indicated by the dotted line), an operator can enter the internal space IS and perform work in the internal space IS appropriately (for example, when performing maintenance on the drive unit 12, the work of fastening bolts B to / from fastening holes 12a formed on the upper surface of the drive unit 12). Furthermore, by switching the cover 13H to the sealed position of the communication hole 13Dc (indicated by the solid line), it is possible to prevent raw material M entering through the hole 13Cb formed by wear of the hub cover 13C from being guided from the upper space ISu to the lower space ISl.

[0044] [Fifth Modification] In the crushing table 13 described above, as shown in FIG. 9, the crushing table 13 may be provided with a detection unit 13I that detects intrusion of the raw material M into the upper space ISu. As shown in FIG. 9, the crushing table 13 includes the detection unit 13I. The detection unit 13I includes a light source 13Ia, an incident unit 13Ib that guides light incident from the light source 13Ia to an optical fiber 13Ic, the optical fiber 13Ic, an irradiation unit 13Id that is disposed in the upper space ISu and emits light guided from the optical fiber 13Ic, an incident unit 13Ie that guides light incident from the irradiation unit 13Id to an optical fiber 13If, the optical fiber 13If, an emission unit 13Ig that emits light guided from the optical fiber 13If, and a detection mechanism 13Ih that detects light emitted from the emission unit 13Ig. The light source 13Ia, the incident unit 13Ib, the emission unit 13Ig, and the detection mechanism 13Ih may be exposed to the outside of the mill housing 11.

[0045] The light source 13Ia and the detection mechanism 13Ih are disposed at fixed positions in the circumferential direction around the central axis C1. On the other hand, the incident unit 13Ib, the optical fiber 13Ic, the irradiation unit 13Id, the incident unit 13Ie, the optical fiber 13If, and the emission unit 13Ig are each fixed to the crushing table 13. Therefore, when the crushing table 13 rotates around the central axis C1, the incident unit 13Ib, the optical fiber 13Ic, the irradiation unit 13Id, the incident unit 13Ie, the optical fiber 13If, and the emission unit 13Ig rotate together with the crushing table 13, respectively.

[0046] In the detection unit 13I, when no raw material M is present on the optical path from the irradiation unit 13Id to the incident unit 13Ie in the upper space ISu, the light incident on the incident unit 13Ib is emitted from the emission unit 13Ig. Therefore, the detection mechanism 13Ih can detect that no raw material M has intruded into the upper space ISu when light is emitted once from the emission unit 13Ig every time the crushing table 13 makes one rotation in the circumferential direction around the central axis C1. On the other hand, the detection mechanism 13Ih can detect that the raw material M has intruded into the upper space ISu when no light is emitted from the emission unit 13Ig every time the crushing table 13 makes one rotation in the circumferential direction around the central axis C1.

[0047] It should be noted that although the detection unit 13I shown in FIG. 9 has a detection mechanism 13Ih that detects light emitted from the emission unit 13Ig, the detection unit 13I may not include the detection mechanism 13Ih. In this case, whether light is emitted once from the emission unit 13Ig every time the pulverizing table 13 makes one rotation in the circumferential direction around the central axis C1 is detected by an operator visually recognizing the light emitted from the emission unit 13Ig. Further, the detection unit 13I may include a wireless communication mechanism (not shown) that transmits to an external device whether intrusion of the raw material M into the upper space ISu has been detected via wireless communication.

[0048] According to the pulverizing table 13 of the present modification, intrusion of the raw material M into the upper space ISu can be appropriately detected by the detection unit 13I. Further, the detection result of the detection unit 13I can be transmitted to an external device via wireless communication.

[0049] The pulverizing table (13) described in each of the embodiments explained above can be understood, for example, as follows.

[0050] The pulverizing table according to the first aspect of the present disclosure is a pulverizing table (13) that pulverizes a raw material supplied from a raw material supply unit (14) between the pulverizing table and a pulverizing roller (21), the pulverizing table comprising: a pulverizing surface (13a) formed in an annular shape centering on an axis (C1) and in contact with the pulverizing roller; a table main body (13B) formed in a cylindrical shape so as to extend in a vertical direction (VD) along the axis, the pulverizing surface being formed above the vertical direction, and a lower portion of the table main body in the vertical direction being fixed to a driving device (12) that generates a driving force for rotating the pulverizing surface around the axis; a cover (13C) fixed above the table main body, disposed on an inner peripheral side of the pulverizing surface, and disposed so as to cover an upper part of an internal space (IS) centered on the axis of the table main body; and a plate (13D) that partitions the internal space (IS) into an upper space (ISu) defined by the cover and a lower space (ISl) defined by the table main body.

[0051] In the first aspect of the present disclosure, a cover is positioned to cover the internal space of the table body, which is formed in a cylindrical shape and extends vertically along its axis. If a hole is formed in the cover due to wear caused by contact with the raw material, there is a risk that the raw material may enter the internal space through the hole. In the first aspect of the present disclosure, the internal space is divided by a plate into an upper space defined by the cover and a lower space defined by the table body. Therefore, even if a hole is formed due to wear on a part of the cover, the raw material entering through the hole will not be guided from the upper space to the lower space. Thus, it is possible to prevent a large amount of raw material from accumulating in the internal space.

[0052] A grinding table according to a second aspect of the present disclosure further comprises the following configuration in the first aspect: the second thickness (T2) of the thickest part of the plate is thinner than the first thickness (T1) of the thinnest part of the cover.

[0053] According to the second aspect of the present disclosure, the first thickness of the thinnest part of the cover is secured to increase durability against wear due to contact with the raw material, while the second thickness of the thickest part of the plate is made thinner than the first thickness to reduce the weight of the grinding table.

[0054] A grinding table according to a third aspect of the present disclosure further comprises the following configuration in the first or second aspect: The cover has a first apex (13Cc) at a position through which the axis passes, and the vertical height gradually decreases toward the outer peripheral side in the radial direction perpendicular to the axis; and the plate has a second apex (13Db) at a position through which the axis passes, and the vertical height gradually decreases toward the outer peripheral side in the radial direction.

[0055] According to the third aspect of the present disclosure, the crushing table is shaped such that the height of the cover gradually decreases in the vertical direction toward the outer periphery, and the plate is shaped such that the height of the plate gradually decreases in the vertical direction toward the outer periphery, thereby reducing the volume of the upper space and maintaining a small volume of raw material accumulated in the upper space.

[0056] A grinding table according to a fourth aspect of this disclosure further comprises the following configuration in the first or second aspect: a filling member (13F) that fills the upper space.

[0057] According to the grinding table of the fourth aspect of this disclosure, since the upper space is filled with a filling material, even if a hole is formed in the cover due to wear, it is possible to prevent raw materials from accumulating in the upper space.

[0058] A grinding table according to a fifth aspect of the present disclosure further comprises the following configuration in the first or second aspect: a lifting section (13G) attached to the upper surface of the plate and connected to a lifting mechanism that lifts the plate upward in the vertical direction.

[0059] According to the fifth aspect of the present disclosure, by connecting a lifting mechanism to the lifting section, the plate can be easily lifted vertically upward by the lifting mechanism.

[0060] A grinding table according to a sixth aspect of this disclosure further comprises the following configuration in the first or second aspect: the second outer diameter (D2) of the plate is set to be less than or equal to the first outer diameter (D1) of the lower vertical end of the cover.

[0061] According to the grinding table of the sixth aspect of this disclosure, the second outer diameter of the plate is set to be less than or equal to the first outer diameter of the lower vertical end of the cover. Therefore, the second outer diameter never becomes larger than the first outer diameter, and when removing the plate, it is not necessary to remove other components on the outer circumference side of the cover. Thus, the plate can be easily removed.

[0062] A grinding table according to a seventh aspect of this disclosure further comprises the following configuration in the first or second aspect: the plate is attached to the mounting surface (13B1b) at the upper end of the table body with a sealing member (13Da) in between.

[0063] According to the grinding table of the seventh aspect of this disclosure, the sealing member can prevent moisture contained in the raw material from being guided from the upper space to the lower space.

[0064] A grinding table according to the eighth aspect of the present disclosure further comprises the following configuration in the first or second aspect: the plate has a communication hole (13Dc) that connects the upper space and the lower space, and a lid (13H) that switches between a sealed state and an open state of the communication hole.

[0065] According to the eighth aspect of the present disclosure, by switching the lid to a state in which the communication holes are open, an operator can enter the internal space and perform work in the internal space appropriately. Furthermore, by switching the lid to a state in which the communication holes are sealed, it is possible to prevent raw materials entering through holes formed by wear of the cover from being guided from the upper space to the lower space.

[0066] The grinding table according to the ninth aspect of this disclosure further comprises the following configuration in the first or second aspect: namely, a detection unit (13I) for detecting the intrusion of the raw material into the upper space. According to the grinding table according to the ninth aspect of this disclosure, the detection unit can appropriately detect the intrusion of the raw material into the upper space.

[0067] The grinding table according to the tenth aspect of this disclosure further comprises the following configuration in the ninth aspect: the detection unit transmits to an external device via wireless communication whether or not it has detected the intrusion of the raw material. According to the grinding table according to the tenth aspect of this disclosure, the detection result of the detection unit can be transmitted to an external device via wireless communication.

[0068] A grinding apparatus according to the eleventh aspect of this disclosure comprises a grinding table as described in the first or second aspect, a drive device that generates a driving force to rotate the grinding table about the axis, and a grinding roller that grinds the raw material between itself and the grinding table. According to the grinding apparatus according to the eleventh aspect of this disclosure, even if a part of the cover that covers the internal space of the table body wears down and a hole is formed, it is possible to prevent a large amount of raw material from accumulating by entering through the hole.

[0069] 10 Crusher (Crushing device) 11 Housing 11a Ceiling 11b Peripheral wall 11c Opening 12 Drive device 12a Fastening hole 13 Crushing table 13A Table liner 13Aa Recess 13B Table body 13B1 Housing section 13B1a Fastening hole 13B1b Mounting surface 13B2 Cylindrical section 13B3 Flange section 13B3a Insertion hole 13C Hub cover 13Ca Insertion hole 13Cb Hole 13Cc First apex 13D Hub plate 13Da Seal member 13Dc Communication hole 13E Wedge ring 13Ea Protrusion 13F Filling member 13G Lifting section 13H Cover section 13I Detection section 13Ia Light source 13Ib Incident section 13Ic Optical fiber 13Id Irradiation section 13Ie Incident section 13If Optical fiber 13Ig Outlet section 13Ih Detection mechanism 13a Grinding surface 14 Input pipe (raw material supply section) 15 Inlet port 16 Classification blade 17 Rotary separator 18 Outlet port 20 Grinding roller unit 21 Grinding roller 22 Journal shaft 23 Journal head 23a Projection 23b Arm section 24 Pivot shaft (pivot pin) 25 Stopper 26 Biasing device 26a Hydraulic cylinder 26b Plunger 32 Conveying gas outlet 32a Vane 100 Lifting mechanism B Fastening bolt C1 Center axis D1, D2 Outer diameter IS Internal space ISl Lower space ISu Upper space M Raw material RD Radial direction T1, T2: Thickness; VD: Vertical direction; Y1: Axis.

Claims

1. A grinding table for grinding raw materials supplied from a raw material supply unit in relation to a grinding roller, comprising: a grinding surface formed in an annular shape around an axis and in contact with the grinding roller; a table body formed in a cylindrical shape extending vertically along the axis, with the grinding surface formed above it in the vertical direction and fixed below it in the vertical direction to a drive device that generates a driving force to rotate the grinding surface around the axis; a cover fixed above the table body and positioned on the inner circumference side of the grinding surface, positioned to cover the upper part of the internal space of the table body centered on the axis; and a plate that divides the internal space into an upper space defined by the cover and a lower space defined by the table body.

2. The grinding table according to claim 1, wherein the second thickness of the thickest part of the plate is thinner than the first thickness of the thinnest part of the cover.

3. The crushing table according to claim 1 or claim 2, wherein the cover has a first apex at a position through which the axis passes and has a shape in which the vertical height gradually decreases toward the outer peripheral side in the radial direction perpendicular to the axis, and the plate has a second apex at a position through which the axis passes and has a shape in which the vertical height gradually decreases toward the outer peripheral side in the radial direction.

4. The grinding table according to claim 1 or claim 2, further comprising a filling member that fills the upper space.

5. The crushing table according to claim 1 or claim 2, further comprising a lifting section attached to the upper surface of the plate and connected to a lifting mechanism that lifts the plate upward in the vertical direction.

6. The grinding table according to claim 1 or claim 2, wherein the second outer diameter of the plate is set to be less than or equal to the first outer diameter of the lower vertical end of the cover.

7. The crushing table according to claim 1 or claim 2, wherein the plate is attached to the mounting surface of the upper end of the table body with a sealing member in between.

8. The crushing table according to claim 1 or 2, wherein the plate has a communication hole formed therein that connects the upper space and the lower space, and the table is further provided with a lid that can switch between a state in which the communication hole is sealed and a state in which the communication hole is open.

9. A grinding table according to claim 1 or claim 2, further comprising a detection unit for detecting the intrusion of the raw material into the upper space.

10. The grinding table according to claim 9, wherein the detection unit transmits to an external device via wireless communication whether or not it has detected the intrusion of the raw material.

11. A grinding apparatus comprising: a grinding table according to claim 1 or claim 2; a drive device that generates a driving force to rotate the grinding table about the axis; and a grinding roller that grinds the raw material between itself and the grinding table.

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