JP6193118B2 - Bearing device and grinding device - Google Patents

Description

  The present invention relates to a bearing device and a grinding device.

  In combustion facilities such as boiler power generation, solid fuel such as coal and biomass is used as fuel. The solid fuel is pulverized by a pulverizer and converted into a powder fuel suitable for combustion. In the combustion facility, powdered fuel is used as fuel.

  The crushing device includes a crushing table and a crushing roller that crushes the solid fuel between the crushing table. The crushing roller is supported by the shaft member. The shaft member is supported by a cylindrical bearing device. An example of a bearing device having a cylindrical bearing member is disclosed in Patent Document 1 and Patent Document 2.

Japanese Patent Laid-Open No. 06-200946 International Publication No. 2007/132735

  In the bearing device, grease is supplied between the shaft member and the bearing member. If the supplied grease does not spread sufficiently between the shaft member and the bearing device, the performance of the bearing device may be degraded. Not only the bearing device of the crusher, but also the bearing device that supports the shaft member used in another device so as to be movable in the axial direction or rotatable around the shaft, the performance is deteriorated unless the supplied grease is sufficiently distributed. there's a possibility that.

  It is an object of the present invention to provide a bearing device and a pulverizing device that can sufficiently spread grease and suppress deterioration in performance.

  A bearing device according to the present invention includes a cylindrical bearing member having an inner peripheral surface, a first annular groove formed in the inner peripheral surface so as to surround the central axis of the bearing member, and a parallel to the central axis. A second annular groove formed on the inner peripheral surface away from the first annular groove with respect to the direction, a supply port for supplying grease, and one end portion of the first annular groove are provided inside the first annular groove. The inner circumference is connected to the groove, the other end is connected to the second annular groove, and the inner circumference is pivoted at least partially around the central axis between the first annular groove and the second annular groove. A spiral groove formed on the surface.

  According to the present invention, since the supply port is disposed in the first annular groove, at least a part of the grease supplied from the supply port can flow in the first annular groove. Since one end of the spiral groove is connected to the first annular groove, at least a part of the grease flowing through the first annular groove can flow into the spiral groove. Since the spiral groove is formed so as to turn at least part of the periphery of the central axis, the grease can be spread in the circumferential direction and the axial direction of the inner peripheral surface of the bearing member. Since the other end of the spiral groove is connected to the second annular groove, at least a part of the grease can flow in the second annular groove. Thus, according to the present invention, the grease supplied from the supply port can be spread over a wide range on the inner peripheral surface. Therefore, a decrease in the performance of the bearing device is suppressed.

  In the bearing device according to the present invention, the shaft member disposed inside the inner peripheral surface is supported so as to be movable in a direction parallel to the central axis or rotatable around the central axis, and supplied from the supply port. The grease may discharge foreign matter in the internal space between the outer peripheral surface of the shaft member and the inner peripheral surface.

  Accordingly, the foreign matter in the internal space is smoothly discharged by the grease flowing from the first annular groove toward the second annular groove in the direction parallel to the central axis.

  In the bearing device according to the present invention, a grease seal member that is disposed outside the first annular groove with respect to a direction parallel to the central axis and suppresses the grease from flowing out of the internal space, and a direction parallel to the central axis A first seal member that is disposed outside the grease seal member with respect to the inner space, and that is disposed outside the second annular groove with respect to a direction parallel to the central axis. And a second seal member that suppresses intrusion of foreign matter to the surface.

  Therefore, the foreign matter in the external space is prevented from entering the internal space by each of the first seal member and the second seal member. Further, the grease seal member suppresses the grease supplied from the supply port from flowing into the space outside the grease seal member.

  In the bearing device according to the present invention, the first external space outside the first seal member in the direction parallel to the central axis is a second outer space outside the second seal member in the direction parallel to the central axis. It may be a space with more foreign objects than the external space.

  Therefore, even if the foreign material in the first external space is drawn into the internal space by the movement of the shaft member in the direction parallel to the central axis or the rotation of the shaft member, the first annular groove side (the bearing member in the direction parallel to the central axis). The foreign matter in the internal space is discharged to the second external space side by the grease flowing from the one end portion side to the second annular groove side (the other end portion side of the bearing member). Since the grease seal member is not disposed outside the second annular groove, the foreign matter in the internal space is smoothly discharged into the second external space together with the grease. Since the grease seal member and the foreign matter seal member are disposed outside the first annular groove, the grease and the foreign matter in the internal space are suppressed from being discharged to the first external space.

  In the bearing device according to the present invention, the spiral groove may be formed to make at least one round around the central axis.

  Accordingly, the grease flows along the spiral groove, so that it can be spread over a wide range on the inner peripheral surface.

  The bearing apparatus which concerns on this invention WHEREIN: The said supply port may be provided in the connection part of the said 1st annular groove connected with the said one end part of the said spiral groove.

  Therefore, the grease supplied from the supply port is smoothly supplied to each of the first annular groove and the spiral groove.

  In the bearing device according to the present invention, the spiral groove includes a first spiral groove having one end connected to the first portion of the first annular groove and the other end connected to the second portion of the second annular groove. And one end portion is connected to a third portion of the first annular groove different from the first portion, and the other end portion is connected to a fourth portion of the second annular groove different from the second portion. Two spiral grooves, and the first spiral groove and the second spiral groove may be parallel to each other.

  Therefore, the grease supplied from the supply port can spread over a wide range by the plurality of spiral grooves.

  In the bearing device according to the present invention, the supply port may be provided in the first portion.

  Therefore, the grease supplied from the supply port is smoothly distributed to each of the first annular groove and the first spiral groove. At least a part of the grease flowing through the first annular groove and the first spiral groove flows into the second spiral groove and flows through the second spiral groove. Thereby, the grease can spread over a wide range on the inner peripheral surface.

  In the bearing device according to the present invention, a width of the first annular groove may be larger than a width of the spiral groove.

  Therefore, the grease supplied from the supply port can smoothly flow through the first annular groove, and can smoothly flow into the spiral groove connected to the first annular groove.

  A pulverizing apparatus according to the present invention includes a pulverizing table, a pulverizing roller that pulverizes solid fuel between the pulverizing table, a shaft member that supports the pulverizing roller, and the bearing device that supports the shaft member, Is provided.

  According to the present invention, since the deterioration of the performance of the bearing device is suppressed, the deterioration of the performance of the crushing device is also suppressed.

  A pulverizing apparatus according to the present invention includes a pulverizing table, a pulverizing roller that pulverizes solid fuel between the pulverizing table, a shaft member that supports the pulverizing roller, and a cylindrical bearing member having an inner peripheral surface. A bearing device that supports the shaft member so as to be movable in the direction parallel to the central axis of the bearing member inside the inner peripheral surface or to be rotatable about the central axis, the bearing device comprising the center A first annular groove formed in a partial region of the inner peripheral surface close to one end of the bearing member in a direction parallel to the axis, and close to the other end of the bearing member in a direction parallel to the central axis A second annular groove formed in a partial region of the inner peripheral surface; a supply port for supplying grease; and one end connected to the first annular groove; The other end is connected to the second annular groove, and the first annular groove and the front A spiral groove formed on the inner peripheral surface so as to turn at least part of the periphery of the central axis between the second annular groove, and one end of the bearing member is The grease that is disposed nearer to the crushing roller than the other end and supplied from the supply port causes foreign matter in the internal space between the outer peripheral surface of the shaft member and the inner peripheral surface to be other than the bearing member. It is discharged from the end side.

  According to the present invention, since the supply port is disposed in the first annular groove, at least a part of the grease supplied from the supply port can flow in the first annular groove. Since one end of the spiral groove is connected to the first annular groove, at least a part of the grease flowing through the first annular groove can flow into the spiral groove. Since the spiral groove is formed so as to turn at least part of the periphery of the central axis, the grease can be spread in each of the circumferential direction and the axial direction of the inner peripheral surface. Since the other end of the spiral groove is connected to the second annular groove, at least a part of the grease can flow in the second annular groove. Thus, according to the present invention, the grease supplied from the supply port can be spread over a wide range on the inner peripheral surface. Further, one end of the bearing member is disposed closer to the grinding roller than the other end of the bearing member, and the movement of the shaft member in a direction parallel to the central axis causes foreign matter around the grinding roller to be removed from the bearing member. There is a high possibility of being drawn into the internal space from the other end side. According to the present invention, the grease is directed from the first annular groove side (one end side of the bearing member) toward the second annular groove side (the other end side of the bearing member) in the internal space in a direction parallel to the central axis. Since the fluid flows, the foreign matter in the internal space is smoothly discharged from the other end side of the bearing member together with the grease. Therefore, a decrease in the performance of the pulverizer is suppressed.

  According to the bearing device and the pulverizing device according to the present invention, the performance degradation is suppressed.

FIG. 1 is a diagram illustrating an example of a pulverizing apparatus according to the present embodiment. FIG. 2 is a diagram illustrating an example of a bearing device according to the present embodiment. FIG. 3 is a diagram illustrating an example of a bearing device according to the present embodiment. FIG. 4 is a development view showing an example of a bearing device according to the present embodiment. FIG. 5 is a development view showing an example of the bearing device according to the present embodiment. FIG. 6 is a development view showing an example of a bearing device according to the present embodiment.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings, but the present invention is not limited thereto. The requirements of the embodiments described below can be combined as appropriate. Some components may not be used.

  FIG. 1 is a diagram illustrating an example of a pulverizing apparatus 1 according to the present embodiment. The pulverizing apparatus 1 is also called a roller mill apparatus. The pulverizer 1 pulverizes solid fuels such as coal and biomass to produce powdered fuel suitable for combustion. Biomass is an organic resource derived from renewable organisms. Biomass includes, for example, at least one of thinned wood, waste wood, driftwood, grass, waste, sludge, tires, and recycled fuel (pellets and chips) using these as raw materials. In the following description, the solid fuel is coal (raw coal), and the pulverizer 1 pulverizes the coal to generate coal powder fuel (pulverized coal).

  As shown in FIG. 1, the crushing device 1 includes a housing 2, a crushing table 3 disposed inside the housing 2, and a crushing roller disposed inside the housing 2 and crushing coal between the crushing table 3. 4, a shaft member 5 that supports the crushing roller 4, a bearing device 6 that supports the shaft member 5, a coal supply pipe 7 that is disposed at the top of the housing 2, and a rotary classification that is disposed inside the housing 2. Machine 8.

  Coal is supplied into the housing 2 from the coal supply device via the coal supply pipe 7. The crushing table 3 is disposed below the coal supply pipe 7. Coal is supplied to the crushing table 3 through the coal supply pipe 7.

  The crushing table 3 has a table liner 3A. The upper surface of the table liner 3A is inclined upward toward the outside. The crushing table 3 rotates around the axis AX by the operation of the driving device 9. The drive device 9 includes a support member 9A connected to the crushing table 3, a worm wheel 9B fixed to the support member 9A, and a motor 9D having a worm gear 9C that meshes with the worm wheel 9B. The crushing table 3 is rotatably supported by the housing 2 via the support member 9A. When the worm gear 9C is rotated by the operation of the motor 9D, the worm wheel 9B is rotated. When the worm wheel 9B rotates, the support member 9A and the crushing table 3 rotate about the axis AX.

  The crushing roller 4 crushes the coal supplied from the coal supply pipe 7 to the crushing table 3 in cooperation with the crushing table 3. The crushing roller 4 is disposed so as to face the crushing table 3. A plurality of (for example, three) crushing rollers 4 are arranged.

  The shaft member 5 is connected to the crushing roller 4. A crushing roller 4 is disposed at the tip of the shaft member 5. The bearing device 6 supports the shaft member 5 in a rotatable manner. In this embodiment, the bearing device 6 rotatably supports the shaft member 5 around the central axis of the shaft member 10A.

  The bearing device 6 is supported by the housing 2 via the support device 10. The support device 10 is provided in the housing 2, and is connected to the shaft member 10 </ b> A that supports the crushing roller 4 so as to be able to swing (tilt) and the bearing device 6, and is a first arm portion disposed above the bearing device 6. 10B, a drive device 10C including a hydraulic cylinder and an intermediate piston 10P that can move the first arm portion 10B, a second arm portion 10D connected to the bearing device 6 and disposed below the bearing device 6, It has a stopper member 10E arranged at a position where it can come into contact with the two arm portions 10D. When the hydraulic cylinder of the drive device 10C pushes the intermediate piston 10P, the intermediate piston 10P pushes the first arm portion 10B. When the first arm portion 10B is pushed by the drive device 10C, the bearing device 6 rotates (tilts) about the shaft member 10A so that the grinding roller 4 approaches the grinding table 3. When the second arm portion 10D comes into contact with the stopper member 10E fixed to the housing 2, the movable range of the crushing roller 4 is restricted. The support device 10 can adjust the relative position (gap size) between the crushing table 3 and the crushing roller 4 by moving the bearing device 6 with the drive device 10 </ b> C.

  When coal is supplied to the crushing table 3 and the crushing table 3 rotates, the coal supplied to the crushing table 3 moves on the crushing table 3 by the centrifugal force generated by the rotation of the crushing table 3. The coal enters the gap between the grinding roller 4 and the grinding table 3. In a state where the pulverizing roller 4 presses the coal, the pulverizing table 3 rotates, whereby the coal is pulverized and pulverized coal is generated. In this embodiment, the grinding roller 4 pressed against the grinding table 3 side rotates in conjunction with the grinding table 3.

  The pulverizing apparatus 1 is provided in the housing 2, an inlet port 11 that supplies primary air into the housing 2, an outlet port 12 that is provided in the housing 2 and discharges the generated pulverized coal, and a foreign matter discharge port. 13.

  The rotary classifier 8 is disposed below the outlet port 12. The generated pulverized coal is classified by the rotary classifier 8, and pulverized coal having a particle size suitable for fuel is discharged from the outlet port 12 to the outside of the housing 2.

  FIG. 2 is a cross-sectional view showing an example of the shaft member 10A and the bearing device 6 according to the present embodiment. The bearing device 6 includes a cylindrical bearing member 20 having an inner peripheral surface 21 and a grease supply port 22 disposed on the inner peripheral surface 21 of the bearing member 20. In the present embodiment, the bearing device 6 includes a slide bearing and receives the shaft member 10 </ b> A on the inner peripheral surface (slide surface) 21 of the bearing member 20. The bearing member 20 is disposed around the shaft member 10A. The inner peripheral surface 21 is disposed around the central axis J of the bearing member 20. The shaft member 10 </ b> A is disposed inside the inner peripheral surface 21.

  The bearing device 6 supports the shaft member 10 </ b> A disposed inside the inner peripheral surface 21 so as to be rotatable around the central axis J. In the present embodiment, the shaft member 10A rotates around the central axis J. The shaft member 5 rotates around the central axis J while being supported by the bearing device 6. The shaft member 10A may be movable in a direction parallel to the central axis J.

  A supply device 40 for supplying grease is connected to the bearing device 6. The supply device 40 includes a supply pipe 41 connected to the supply port 22 and a supply unit 42 that supplies grease to the supply port 22 via the supply pipe 41. The supply unit 42 includes a so-called grease gun, and can increase the pressure of the grease so that the grease is injected between the bearing member 20 and the shaft member 10A. In the present embodiment, the supply pipe 41 is provided with a detection device 43 that detects the pressure of grease flowing through the supply pipe 41.

  The bearing device 6 includes a first seal device 23 disposed at one end of the bearing member 20 in a direction parallel to the central axis J, and a second seal device 24 disposed at the other end of the bearing member 20. Yes. The first seal device 23 includes a cylindrical support member 25, a foreign matter seal member 26 for suppressing the flow of foreign matter, and a grease seal member 27 for suppressing the flow of grease. The foreign matter seal member 26 and the grease seal member 27 are supported by the support member 25. The second sealing device 24 includes a cylindrical support member 28 and a foreign matter sealing member 29 for suppressing the flow of foreign matter. The foreign matter seal member 29 is supported by the support member 28.

  FIG. 3 is a cross-sectional view showing an example of the bearing member 20 according to the present embodiment. FIG. 4 is a development view showing an example of the bearing member 20 according to the present embodiment. In the following description, a direction parallel to the central axis J is appropriately referred to as an axial direction, and a circumferential direction of the central axis J is appropriately referred to as a circumferential direction.

  As shown in FIGS. 3 and 4, the bearing member 20 is formed on the inner peripheral surface 21 so as to surround the first annular groove 31 formed on the inner peripheral surface 21 so as to surround the central axis J, and on the central axis J. And a spiral groove 30 (30A, 30B, 30C) formed on the inner peripheral surface 21 between the first annular groove 31 and the second annular groove 32.

  Regarding the axial direction, the first annular groove 31 and the second annular groove 32 are separated from each other. The first annular groove 31 is formed in a partial region of the inner peripheral surface 21 close to one end portion of the bearing member 20 in the axial direction. The second annular groove 32 is formed in a partial region of the inner peripheral surface 21 close to the other end portion of the bearing member 20 in the axial direction.

  In the present embodiment, one end portion (first annular groove 31) of the bearing member 20 is disposed closer to the grinding roller 4 than the other end portion (second annular groove 32) of the bearing member 20. In the present embodiment, the one end portion of the bearing member 20 and the first seal device 23 are disposed in the external space SA including the grinding roller 4. The other end of the bearing member 20 and the second seal device 24 are disposed in the external space SB away from the crushing roller 4.

  The first annular groove 31 is formed to be continuous in the circumferential direction without interruption. The second annular groove 32 is formed to be continuous in the circumferential direction without interruption. The first annular groove 31 is formed to be orthogonal to the central axis J. That is, with respect to the axial direction, the position of the first annular groove 31 does not change in all regions of the first annular groove 31. Similarly, the second annular groove 32 is formed to be orthogonal to the central axis J.

  The spiral groove 30 is formed on the inner peripheral surface 21 so as to turn at least part of the periphery of the central axis J between the first annular groove 31 and the second annular groove 32. One end of the spiral groove 30 is connected to the first annular groove 31. The other end of the spiral groove 30 is connected to the second annular groove 32. The spiral groove 30 is formed between the first annular groove 31 and the second annular groove 32 so as to be continuous without interruption.

  The width W1 of the first annular groove 31 is larger than the width Wr of the spiral groove 30. The width W2 of the second annular groove 32 is larger than the width Wr of the spiral groove 30. The width W1 of the first annular groove 31 is equal to the width W2 of the second annular groove 32.

  The supply port 22 is provided inside the first annular groove 31. In the present embodiment, the supply port 22 is provided at a connection portion of the first annular groove 31 connected to one end of the spiral groove 30. The supply port 22 supplies grease to the internal space SP between the outer peripheral surface 15 and the inner peripheral surface 21 of the shaft member 10A.

  The spiral groove 30 is formed to make at least one round around the central axis J. In this embodiment, the spiral groove 30 is formed so as to make one and a half rounds around the central axis J.

  In the present embodiment, the spiral groove 30 includes a first spiral groove 30A, a second spiral groove 30B, and a third spiral groove 30C. As shown in FIG. 4, the first spiral groove 30A and the second spiral groove 30B are parallel to each other. The second spiral groove 30B and the third spiral groove 30C are parallel to each other.

  One end of the first spiral groove 30A is connected to the portion P1 of the first annular groove 31. The other end of the first spiral groove 30A is connected to the portion P2 of the second annular groove 32. One end of the second spiral groove 30B is connected to the portion P3 of the first annular groove 31. The other end of the second spiral groove 30B is connected to the portion P4 of the second annular groove 32. One end of the third spiral groove 30C is connected to the portion P5 of the first annular groove 31. The other end of the third spiral groove 30C is connected to the portion P6 of the second annular groove 32. The portion P1, the portion P3, and the portion P5 are different portions of the first annular groove 31. The portion P2, the portion P4, and the portion P6 are different portions of the second annular groove 32, respectively. In the present embodiment, the supply port 22 is provided in the portion P1.

  The interval between the portions P1 and P3 in the circumferential direction, the interval between the portions P3 and P5, and the interval between the portions P5 and P1 are equal. The distance between the part P2 and the part P4 in the circumferential direction, the distance between the part P4 and the part P6, and the distance between the part P6 and the part P2 are equal. That is, the part P1, the part P3, and the part P5 are arranged every 120 degrees in the circumferential direction. The part P2, the part P4, and the part P6 are arranged every 120 degrees in the circumferential direction.

  Between the first annular groove 31 and the second annular groove 32, the distance between the first spiral groove 30A and the second spiral groove 30B, the distance between the second spiral groove 30B and the third spiral groove 30C, and the third The interval between the spiral groove 30C and the first spiral groove 30A is equal.

  As shown in FIG. 2, the grease seal member 27 is disposed outside the first annular groove 31 (one end portion of the bearing member 20) with respect to the center of the internal space SP in the axial direction. The grease seal member 27 is an annular member surrounding the shaft member 5. The grease seal member 27 is disposed between the support member 23 and the shaft member 10A so as to contact the outer peripheral surface 15 of the shaft member 10A. The grease seal member 27 suppresses the grease in the internal space SP from flowing into the external space SA.

  The foreign matter seal member 26 is disposed outside the grease seal member 27 with respect to the center of the internal space SP in the axial direction. The foreign material sealing member 26 is an annular member surrounding the shaft member 10A. The foreign matter seal member 26 is disposed between the support member 23 and the shaft member 10A so as to contact the outer peripheral surface 15 of the shaft member 10A. The foreign matter sealing member 26 prevents foreign matter (dust) in the external space SA from entering the internal space SP via one end of the bearing member 20. The foreign matter sealing member 26 may be a V packing.

  The foreign matter sealing member 29 is disposed outside the second annular groove 32 (the other end of the bearing member 20) with respect to the center of the internal space SP in the axial direction. The foreign matter sealing member 29 is an annular member surrounding the shaft member 10A. The foreign material sealing member 29 is disposed between the support member 28 and the shaft member 10A so as to contact the outer peripheral surface 15 of the shaft member 10A. The foreign matter sealing member 29 prevents foreign matter (dust) in the external space SB from entering the internal space SP through the other end of the bearing member 20. In the present embodiment, two foreign matter sealing members 29 are provided in the axial direction. The foreign matter sealing member 29 may be a V packing.

  The external space SA is a space outside the foreign material seal member 26 with respect to the center of the internal space SP in the axial direction. The external space SB is a space outside the foreign material seal member 29 with respect to the center of the internal space SP in the axial direction. The external space SA is a space (an internal space of the housing 2) in which the grinding roller 4 is disposed. That is, the external space SA includes a space where the coal is pulverized (pulverization processing space), and includes a large amount of foreign matter (dust). The foreign matter includes, for example, pulverized coal. The external space SB is a space away from the grinding roller 4 (grinding processing space SA). The external space SB is a space that has fewer foreign matters (such as pulverized coal) than the external space SA. The first annular groove 31 is closer to the grinding roller 4 (grinding processing space SA) than the second annular groove 32.

  Next, an example of operation | movement of the bearing apparatus 6 which concerns on this embodiment is demonstrated. The bearing device 6 supports the shaft member 10A so as to be movable in the axial direction or rotatable in the circumferential direction. Grease is supplied to the internal space SP, and the shaft member 10 </ b> A can move or rotate smoothly inside the inner peripheral surface 21.

  At least a part of the shaft member 10A protrudes from one end of the bearing member 20 and is disposed in the external space SA. The external space SA includes a space in which the crushing roller 4 is disposed, and has a larger amount of foreign matter (has a higher degree of contamination) than the external space SB. By disposing at least a part of the shaft member 10A in the external space SA, there is a possibility that foreign matter may adhere to the outer peripheral surface 15 of the shaft member 10A. If the shaft member 10A moves or rotates in a state in which foreign matter adheres to the outer peripheral surface 15 of the shaft member 10A protruding from the other end of the bearing member 20, the foreign matter may be drawn into the internal space SP. In the present embodiment, although the foreign material sealing member 26 is disposed, there is a possibility that the foreign material may enter the internal space SP due to the movement or rotation of the shaft member 10A.

  In the present embodiment, grease is supplied from the supply device 40 to the internal space SP, for example, during maintenance of the bearing device 6 in order to discharge the foreign matter in the internal space SP. The grease is supplied from the supply port 22 disposed in the first annular groove 31 to the internal space SP. At least a part of the grease supplied from the supply port 22 flows through the first annular groove 31.

  One end of the spiral groove 30 is connected to the first annular groove 31. Therefore, at least a part of the grease flowing through the first annular groove 31 flows into the spiral groove 30 and flows through the spiral groove 30. The spiral groove 30 is formed to turn at least a part around the central axis J. The grease that is guided by the spiral groove 30 and flows in the internal space SP reaches the space between the non-formation region of the inner peripheral surface 21 and the outer peripheral surface 15 where the spiral groove 30 is not formed. As described above, the grease can spread in the circumferential direction and the axial direction of the inner peripheral surface 21 (internal space SP).

  The other end of the spiral groove 30 is connected to the second annular groove 32. Therefore, at least a part of the grease flowing in the internal space SP between the first spiral groove 31 and the second spiral groove 32 flows into the second annular groove 32. The grease in the internal space SP is discharged to the external space SB side through the second annular groove 32 and the other end of the bearing member 20. As a result, grease that has a high possibility of containing foreign substances present in the internal space SP is discharged from the internal space SP by the clean grease supplied from the supply port 22, and the internal space SP is replaced with clean grease. Is done.

  As described above, according to the present embodiment, the clean grease supplied from the supply port 22 can be sufficiently distributed to the internal space SP. Therefore, the internal space SP is replaced with clean grease supplied from the supply port 22 from grease that is highly likely to contain foreign substances. Therefore, a decrease in performance of the bearing device 6 is suppressed, and the shaft member 10 </ b> A can move smoothly inside the inner peripheral surface 21.

  In the present embodiment, the external space SA is a space with more foreign matter than the external space SB, and there is a high possibility that foreign matter will enter the internal space SP from the external space SA. In the present embodiment, the supply port 22 is disposed inside the first annular groove 31, and the spiral groove 30 is provided so that the grease flows from the first annular groove 31 toward the second annular groove 32. That is, in the present embodiment, the grease flows from one end side of the bearing member 20 toward the other end side in the internal space SP. Therefore, foreign matter in the internal space SP is smoothly discharged from the one end portion side of the bearing member 20 to the external space SB side. In this embodiment, since the grease seal member is not disposed on the other end side of the bearing member 20, the foreign matter in the internal space SP is smoothly discharged into the external space SB together with the grease.

  In the present embodiment, the foreign matter seal member 26 prevents foreign matter in the external space SA from entering the internal space SP, and the foreign matter seal member 29 prevents foreign matter in the external space SB from entering the internal space SP. Yes. Thereby, the fall of the performance of the bearing apparatus 6 is suppressed.

  In the present embodiment, the grease seal member 27 prevents the grease in the internal space SP from flowing into the external space SA. Therefore, contamination of the external space SA with grease is suppressed. In the present embodiment, even if high-pressure grease is supplied from the supply port 22 provided in the vicinity of one end of the bearing member 20, the grease is supplied from the one end of the bearing member 20 by the spiral groove 30. Smoothly flows toward the other end side. Therefore, even if high-pressure grease is supplied, high pressure is prevented from acting on the grease seal member 27. In the present embodiment, even when high-pressure grease is supplied, the helical groove 30 prevents the allowable pressure (for example, 2 MPa) of the grease seal member 27 from acting on the grease seal member 27.

  In the present embodiment, the spiral groove 30 is formed so as to go around the central axis J at least once. Therefore, when the grease flows along the spiral groove 30, it can be spread over a wide range in the internal space SP.

  Moreover, in this embodiment, the supply port 22 is provided in the part P1 of the 1st annular groove 31 connected with the one end part of 30 A of 1st spiral grooves. Therefore, the grease supplied from the supply port 22 is smoothly supplied to the first annular groove 31 and also smoothly supplied to the spiral groove 30. Therefore, the grease is guided by each of the first annular groove 31 and the spiral groove 30 and can spread over a wide range in the internal space SP.

  In the present embodiment, a plurality of spiral grooves 30 are provided. With the plurality of spiral grooves 30 (first spiral groove 30A, second spiral groove 30B, and third spiral groove 30C), the grease supplied from the supply port 22 can spread over a wide range in the internal space SP.

  In the present embodiment, the width W1 of the first annular groove 31 is larger than the width Wr of the spiral groove 30. Therefore, the grease supplied from the supply port 22 can smoothly flow through the first annular groove 31 and can smoothly flow into the spiral groove 30 connected to the first annular groove 31.

  FIG. 5 is a diagram illustrating an example of a bearing member 20B according to the present embodiment. As illustrated in FIG. 5, the spiral groove 30 (the first spiral groove 30A, the second spiral groove 30B, and the third spiral groove 30C) may be formed so as to make one round of the central axis J.

  FIG. 6 is a diagram illustrating an example of a bearing member 20C according to the present embodiment. As shown in FIG. 6, the spiral groove 30 (the first spiral groove 30A, the second spiral groove 30B, and the third spiral groove 30C) may be formed so as to go around the central axis J twice.

  The three spiral grooves 30 (the first spiral groove 30A, the second spiral groove 30B, and the third spiral groove 30C) are preferably provided so as to turn around the central axis J in the range of 1 round to 2 rounds. For example, if the three spiral grooves 30 are provided so as to turn around the central axis J by two or more halves, the distance between the adjacent spiral grooves 30 becomes short, and the grease hardly flows in the axial direction. There is a high possibility that the entire SP will not be distributed.

  The number of spiral grooves 30 and the number of turns around the central axis J may be determined based on the inner diameter of the bearing member 20 (the outer diameter of the shaft member 10A). The spiral groove 30 may be only one spiral groove, two spiral grooves, or may include four or more arbitrary plural spiral grooves.

  In the above-described embodiment, the intermediate piston 10P may be supported by the bearing device 6 (bearing member 20). The intermediate piston 10P is a shaft member, and is movable in a direction parallel to the central axis of the intermediate piston 10P while being supported by the bearing member 20.

  In the above-described embodiment, the grease is supplied during the maintenance of the bearing device 6 (pulverization device 1). The supply of grease may be performed during the operation of the bearing device 6 (pulverization device 1). For example, an automatic supply device capable of supplying grease even in the operation of the pulverizer 1 may be provided, and the grease may be supplied using the automatic supply device. When the shaft member moves (reciprocates) in a direction parallel to the central axis, grease can be supplied during maintenance (when operation is stopped) and during operation, so that deterioration in the performance of the bearing device can be suppressed. Even when the shaft member rotates about the central axis, the supply of grease may be performed during maintenance or during operation.

  In the above-described embodiment, the example in which the bearing device 6 is applied to the grinding device 1 has been described. Of course, the bearing device 6 may be applied to a device different from the grinding device 1. With respect to the axial direction, one end of the bearing member 20 is disposed in the first space such as the external space SA, and the other end of the bearing member 20 is the second space such as the external space SB having a lower degree of contamination than the first space. When the grease is supplied from the supply port 22 arranged in the first annular groove 31, the foreign matter that has entered the internal space SP from the first space via the one end of the bearing member 20 is supplied. The clean grease supplied from the port 22 is discharged to the second space side. Further, since the grease supplied to the vicinity of the one end portion of the bearing member 20 smoothly flows toward the other end portion of the bearing member 20 through the spiral groove 30, the grease passes through the one end portion of the bearing member 20 to the first. Outflow into the space is suppressed.

DESCRIPTION OF SYMBOLS 1 Crushing device 3 Crushing table 6 Bearing device 10A Shaft member 15 Outer peripheral surface 20 Bearing member 21 Inner peripheral surface 22 Supply port 26 Foreign material sealing member 27 Grease seal member 29 Foreign material sealing member 30 Spiral groove 30A 1st spiral groove 30B 2nd spiral groove 30C 3rd spiral groove 31 1st annular groove 32 2nd annular groove 40 Supply device J Central axis P1 part P2 part P3 part P4 part P5 part P6 part SA external space SB external space SP internal space

Claims (8)

A cylindrical bearing member having an inner peripheral surface;
A first annular groove formed in the inner peripheral surface so as to surround the central axis of the bearing member;
A second annular groove formed in the inner peripheral surface away from the first annular groove in the axial direction;
A supply port that is provided inside the first annular groove and supplies grease;
One end is connected to the first annular groove, the other end is connected to the second annular groove, and at least part of the periphery of the central axis is between the first annular groove and the second annular groove. A spiral groove formed on the inner peripheral surface to pivot,
A grease seal member in the axial direction Ru is disposed outside of said first annular groove,
A first sealing member that will be positioned on the outer side than the grease seal member in the axial direction,
A second sealing member that will be disposed outside the second annular groove in the axial direction,
With
A shaft member disposed inside the inner peripheral surface is supported so as to be movable in the axial direction or rotatable around the central axis,
The grease seal member suppresses the outflow of the grease in the internal space between the outer peripheral surface of the shaft member and the inner peripheral surface,
The first seal member suppresses entry of foreign matter into the internal space,
The second seal member suppresses entry of foreign matter into the internal space,
The first external space outside the first seal member in the axial direction is a space with more foreign matter than the second external space outside the second seal member in the axial direction.
By the grease supplied from the supply port, the foreign matter of the inner space is discharged through the second sealing member to the second external space,
Bearing device.   The bearing device according to claim 1, wherein the spiral groove is formed to make at least one round around the central axis.   The bearing device according to claim 1, wherein the supply port is provided at a connection portion of the first annular groove connected to the one end portion of the spiral groove. The spiral groove has one end connected to the first portion of the first annular groove and the other end connected to the second portion of the second annular groove. A second spiral groove connected to a third part of the first annular groove different from the part and having the other end connected to a fourth part of the second annular groove different from the second part,
The bearing device according to any one of claims 1 to 3, wherein the first spiral groove and the second spiral groove are parallel to each other.   The bearing device according to claim 4, wherein the supply port is provided in the first portion.   The bearing device according to any one of claims 1 to 5, wherein a width of the first annular groove is larger than a width of the spiral groove. A grinding table,
A crushing roller for crushing solid fuel with the crushing table;
A shaft member for supporting the grinding roller;
The bearing device according to any one of claims 1 to 6, which supports the shaft member;
A crusher comprising: A grinding table,
A crushing roller for crushing solid fuel with the crushing table;
A shaft member for supporting the grinding roller;
A bearing device including a cylindrical bearing member having an inner peripheral surface, and supporting the shaft member so as to be movable or rotatable in the axial direction inside the inner peripheral surface;
With
The bearing device includes:
A first annular groove formed in a partial region of the inner peripheral surface near one end of the bearing member in the axial direction;
A second annular groove formed in a region of the inner peripheral surface near the other end of the bearing member in the axial direction;
A supply port that is provided inside the first annular groove and supplies grease;
One end is connected to the first annular groove, the other end is connected to the second annular groove, and at least around the central axis of the bearing member between the first annular groove and the second annular groove. A spiral groove formed in the inner peripheral surface so as to swivel a portion;
A grease seal member in the axial direction Ru is disposed outside of said first annular groove,
A first sealing member that will be positioned on the outer side than the grease seal member in the axial direction,
A second sealing member that will be disposed outside the second annular groove in the axial direction,
Have
The grease seal member suppresses the outflow of the grease in the internal space between the outer peripheral surface of the shaft member and the inner peripheral surface,
The first seal member suppresses entry of foreign matter into the internal space,
The second seal member suppresses entry of foreign matter into the internal space,
The first external space outside the first seal member in the axial direction is a space in which the crushing roller is disposed, and is more than the second external space outside the second seal member in the axial direction. Is a space with many foreign objects,
By the grease supplied from the supply port, the foreign matter of the inner space is discharged through the second sealing member to the second external space,
Crushing equipment.

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